Tutankhamen was not a very influential Pharaoh

Tutankhamen was not a very influential Pharaoh. However his tomb has revealed significant information about the New Kingdom Egypt. When Tutankhamen moved the court back to Thebes, he turned his back to the Reforms of Amarna period. He was at a very young age therefore his decisions must have been under the advice of someone. ROLE OF THE PHARAOH The Pharaoh had many objectives throughout his life on the throne. These activities included keeping order of his people, religion and had many roles as a warrior and a ruler. Akhenaton’s religious beliefs did not last. His was where seen as heretic. When Tutankhamen came into power, within 10 years he restored all beliefs in the gods that Akhenaten ignored. This put all his followers behind him and gained him respect. This can be illustrated through the decorations in Tutankhamun’s tomb. He was seen with various gods, which depicted he believed in number of gods that Akhenaten did not. Further more there were drawings and pictures of the god Hapi and statues of the gods Isis, Nephthys, Serqet and Neith protecting the body of the king. It was important that the Pharaoh had strong relation with the gods and his religion. This showed a power within the pharaoh and provided loyalty by the people of the kingdom. He also had to be a ruler and keep his people in order. He did this through entertainments such as hunting. Evidence of this is found on his chest when he is hunting for animals. Hunting was a way of entertainment and to keep people please in the New kingdom Egypt. Hunting wild animals showed that there was none greater than the pharaoh. This secured his people’s belief and trust in him. There are also statues of the god of Water and Fertility (Hapi). This is an indication that Tutankhamen believed in this god. Therefore the fertility and wealth of the kingdom must have been good. The people of the kingdom had the pharaoh to thank to as a living god. MILITARY Tutankhamen was seen as a warrior in various drawings of him in his tomb. He was seen as a ruler and Ma’ar of the kingdom. Infact he is seen wearing the blue war crown of a pharaoh to indicate his relation with war and hunting. His rule over war and military is also demonstrated in the painting on the sides of his treasure chest, showing him either hunting wild animals or in battle. In the scene he is seen has fighting in a battle on his chariot, with his bow and arrows, he is shown has huge however his enemies much smaller. Tutankhamen was a great influence to his people in war. His ruling power was shown through his mask, which states him as a pharaoh. The mask is made of pure gold and has the two protective animals in it, the cobra and the vulture. However, Tutankhamen has never been involved in a war himself as there is no evidence of any battles. EGYPTIAN SOCIETY Fashion, food, economies, entertainment and fundamental living ways were very advanced and crucial in the Egyptian Society. The Egyptians usually wore white clothing, because white sustained coolness while black sustained heat. Their clothing was made from the stem of the flax plant. The clothing was a symbol of wealth as poor people and workers usually walked around naked and lived naked. Clothing also showed a man’s rank in the society, this depended on how elaborate his kilt was. Kings, gods and higher-class rulers usually wore colourful clothing this showed that they were noble and rich. Therefore clothing performed the role of symbolism for wealth, rank and importance in the society. However as well as clothing, fashion was very crucial. In Tutankhamen’s tomb, there are bottles of perfumes made from pure coconut oil. This shows the class and quality of the society and it had already advanced to perfumes and make up. The pharaoh had all sorts of skin care in his tomb for after life. There was also food and water provided in Tutankhamen’s tomb for his travel, which indicated the type of food consumed. There was also money provided in the tomb, which indicated the type of currency used. The Egyptian life stile was unique and advanced to all other. Tomb of Tutankhamen help is illustrate the needs of Egyptian society and its unique fundamentals. BURIAL CUSTOMS The burial customs of the ancient Egypt is very complex and symbolic. There are 3 aspects of a soul that the Egyptians believed in, the Kha, the Ba and the Akh. The mummification and burial of the pharaoh was crucial for the soul to keep safe and alive. The Egyptians would mummify someone in the belief that the body would be needed in the after life. The first process was the remove all moisture from the body so the body would not decay. After that his stomach, intestines and liver would be removed and put into special alabaster containers. The heart was left in the body as it would be needed to be weighted in the afterlife. The body then would be wrapped up with over 143 items such as amulets and jewellery to protect the pharaoh in the afterlife. There is proof of the process painted on the walls of Tutankhamen’s tomb. The process of the mummification would take 70 days in total. The body then would be sealed in the pharaoh’s body shaped coffin. In fact the body was put into 3 coffins. 2 made out of wood and the final one pure gold. After 70 days of process, the pharaoh is taken to his tomb and receives the opening of the mouth ceremony. Finally the body is sealed and the gods are left alone with the pharaoh to protect the body. RELIGION AND THE AFTERLIFE The pharaoh’s religion was the most crucial part of his ruling time. He was considered a living god, therefore his way of living was a role model to those below him. The previous pharaoh before Tutankhamen disobeyed all gods but himself. This caused unhappiness in the public and when Tutankhamen came into power, he revived the religious beliefs of the kingdom. The Egyptians believed that in the afterlife, pharaohs would become gods and their hearts would be weighted in line with a feather, if the heart is heavier than the feather than the pharaohs would not gain access.

A View from the Bridge – Notes

A View from the Bridge – Notes â€Å"Just remember, kid, you can quicker get back a million dollars that was stole than a word that you gave away. † Eddie speaks this quote in Act I, while eating dinner with Beatrice and Catherine. This quote reveals the irony and madness of Eddie's character. In the beginning of the play, Eddie tells the story of a young boy who called immigration on his relatives. Eddie lectures Catherine about how they must tell no one about Marco and Rodolpho, the illegal immigrant cousins the family will be hiding. However, in the end of the play, Eddie obviously calls Immigration on these cousins, just like the boy.Miller sets up Eddie so vehemently against betrayal that his transition to the betrayer seems illogical. The set-up requires Eddie to undergo a drastic change, if not complete breakdown, within the play to make such a transition. The force of this transition reveals no only his self-destructive madness, but the deepness of his unspoken love for his niece. This quote also reveals that Eddie knows his own fate—he knows what will happen to him, but cannot escape his fate. Much like Alfieri, Eddie watches himself make decisions he knows will not only ruin his reputation in the community, but also possibly kill him.Eddie may know the consequence of what he does, but remains powerless or too mad to stop it. â€Å"His eyes were like tunnels; my first thought was that he had committed a crime, but soon I saw it was only a passion that had moved into his body, like a stranger. † In this quote, found in Act I, Alferi describes Eddie's appearance at their first meeting, to the audience. Alfieri almost seems to fear Eddie as a paranormal beast, a remnant of the great Greek or Roman tragedy. Alfieri truly believes that Eddie was possessed with, â€Å"passion that has moved into his body, like a stranger,† and was unable to control him.The passion that Alfieri describes is the passion for his niece Catherin e. The passion, unreleased and suppressed in his unconscious was a stranger to Eddie's conscious self that actively denied any thoughts of incest or otherwise. This quote also reveals the style of Alfieri. Alfieri tells the tale of Eddie Carbone as if he is a legend. Eddie is described with dramatic and literary descriptions that are unusual in the dramatic form. â€Å"Eddie: Then why—Oh, B.! Beatrice: Yes, yes! Eddie: My B.! † This quote occurs at the conclusion of the play and is spoken between Eddie and Beatrice.As Eddie lies dying in Beatrice's arms, the couple finds some sort of reconciliation and repair of their torn and battered relationship. Beatrice, even under such horrible circumstances, is able to forgive Eddie. Eddie constantly dominates Beatrice throughout the play, but in this tiny moment Eddie needs Beatrice more than she needs him. It is the first time the audience hears that Eddie needs and it is the first time that he honestly needs Beatrice. Beatric e is the tirelessly forgiving character of the play. She is terribly jealous of her niece, who receives more attention from her husband than she does, but still forgives Eddie in the end.This final scene was one of the major alterations of the revised script of A View from the Bridge. In the original version, Eddie dies at the feet of Catherine. However, because of Beatrice's increased presence in the revised version and downscaling of the relationship between Eddie and Catherine—Eddie must return to Beatrice. Beatrice is the only female who, in the end, needs him. Catherine, now beyond his control, no longer seeks his approval. Thus, Eddie is drawn to Beatrice and for the first time he seeks out Beatrice, her forgiveness and love. â€Å"Beatrice: You want somethin' else, Eddie, and you can never have her! †This quote, spoken by Beatrice in the conclusion of Act II to Eddie, is the first time that Eddie seems to realize his true feelings for Catherine and recognize his own madness. Until this moment, no one has directly spoken about Eddie's feelings for Catherine. Although they are obviously known by Beatrice and Alfieri, know one has dared to actually tell Eddie what is wrong with him. But even when Eddie realizes his demon, the love for his niece, he is powerless to stop it. Eddie lunges forward and attempts to kill Marco. In this moment of Sicilian revenge, Eddie cannot pull himself back or regain any sense of reason.Perhaps even the recognition of the sexual taboo makes Eddie even more determined to seek revenge or at least find some sort of success or honor in his death. Eddie does not even have the power to deny Beatrice's claim, but instead follows through his destructive path. This moment may bring Eddie out of his madness enough to lie in Beatrice's arms as he bleeds to death. Once he has recognized his sinful love for Catherine, Eddie seems to find himself once again—which may explain why he is able to reconcile his relationship with Beatrice. â€Å"Most of the time we settle for half and I like it better.Even as I know how wrong he was, and his death useless, I tremble, for I confess that something perversely pure calls to me from his memory—not purely good, but himself purely And yet, it is better to settle for half, it must be! And so I mourn him—I admit it—with a certain alarm. † This quote deals with the central conflict of A View from the Bridge: the self will verses the will of the community. The whole man that Alfieri describes in Eddie is the self-interested man. Eddie's actions within the play are completely motivated by his own desires at the expense of others.Thus, humans must act halfway to preserve the rules of the community and lives of others. The idea that Alfieri suggests, that Eddie acted as a whole person, unrestrained and uninhibited is true. However, Eddie's wholeness was at the expense of his own family and eventually himself. He only escaped restraint beca use he escaped consideration of other people or the community at large. Eddie's wholeness is a whole interest in his own life. His tragic flaw is this self-interest—a flaw that seems both admirable and alarming to Alfieri. Themes The irrational human animal pic][pic]Eddie looses control of his actions in the play. Driven and possessed by incestuous love for his niece, Eddie resorts to desperate measures to protect his identity and name in the community. Alfieri's commentary often remarks on this theme. Alfieri seems constantly amazed by Eddie's actions and his own reactions to the events of the play. Alfieri sees his own irrational thinking, just as he recognizes Eddie's irrational behavior. Irrationality is also how Alfieri defines acting wholly. The human animal becomes irrational when he acts fully on his instincts—just as Eddie does in the play.Alfieri proposes that humans must act as a half, or restrain some of our instinctual needs or wants for reason. Nonetheles s, Alfieri still admires the irrational—the unleashed human spirit that reacts as it will. Allegiance to community law There is great conflict between community and American law in the play. The community abides by Sicilian-American customs protects illegal immigrants within their homes, values respect and family, is hard working and know the shipping culture, has strong associations with names, believes in trust and wants revenge when a member has been wronged.Some of these values, however, come in conflict with those of the American system of justice. Eddie Carbone chooses to turn against his community and abide by the state laws. He looses the respect of his community and friends—the name and personal identity he treasures. Eddie Carbone, with a stronger allegiance to the community, reverts back to another custom of Sicilian-Americans: revenge. Not only is Eddie pulled back to the values of his community, but the final victor of the play is symbolic of community val ues—the Italian, Marco. Thus, the small community is stronger than American law.Motifs Homosexuality Although specifically articulated, homosexuality or what makes a man â€Å"not right† is a persistent theme of the novel. Eddie obviously identifies Rodolpho as homosexual because Rodolpho sings, cooks and sews a dress for Catherine. Eddie also questions Rodolpho because he does not like to work and has bleach blonde hair that makes him look more feminine. Eddie gives Rodolpho several tests of his masculinity. In the first he teaches Rodolpho how to box and the second, more blatantly, Eddie kisses Rodolpho on the lips.Many critics think that this kiss is a sign of Eddie's own suppressed homosexual feelings, an easy parallel with his kiss with Catherine. Miller seems to take no stand either way, and the sexuality of Rodolpho or Eddie is unclear. However, the stereotypes of the gay man and societal implications of being gay are obvious. Louis and Mike, when talking about Rodolpho, clearly think there is something wrong with him and Eddie speaks directly to Alfieri about the specific things that bother him about Rodolpho. Womanhood The idea of what makes a woman or what defines a woman is very prevalent in the text.Catherine and Beatrice talk specifically about the terms in their conversation in Act I. Beatrice thinks Catherine needs to grow up and become a woman. To do this she needs to decide by herself whether she wants to marry Rodolpho. She needs to stop walking around the house in her slip in front of Eddie, and not sit on the edge of the tub while Eddie shaves his beard. In essence, being a woman means reserve and modesty in front of men, and independently making decisions. The idea of independence or separation from Eddie is coupled with the decision to find another male to attach to, a husband.Catherine's attempt at womanhood is deciding to marry Rodolpho and follow his rules rather than Eddie's. Community Community is a powerful context for the play; it dictates very specific norms and rules for the family that controls the actions of the characters. All of the characters are forced to reconcile between American culture and the Italian community culture that surrounds. The cultural and moral difference between the two provides one of the great conflicts in the play. The tight community around them also creates great tension in the Carbone family because they are constantly being watched.The neighbors knew when Marco and Rodolpho arrived, saw Marco spit in Eddie's face and Eddie die by Marco's hand. The community is the watcher; the group controls and monitors the behavior of every member. Although Eddie takes a substantial turn away from the community by calling the Immigration Bureau, he still needs acceptance and spends his last moments fighting Marco for his good name in the community. Symbols High Heels [pic][pic]For Catherine, high heels are representative of womanhood, flirtation and sexiness.She has just starte d wearing high heels around the community and to school and obviously enjoys the attention she gets from men. They are also symbolic as a rite-of-passage to womanhood. As Eddie strongly disapproves of her wearing them, Catherine purposefully rebels against her uncle every time she puts them on. The high heels give her sexual power over men—they look, stare and gawk at her beauty. Eddie thinks the heels are threatening for the same reasons Catherine loves them. Eddie is fearful that, if she looks attractive, some man will ask her out and she will leave the house.Eddie has a powerful reaction when she wears the high heels, as if she must take them off so they do not arouse him or anyone else. Brooklyn Bridge The Brooklyn Bridge is symbolic of a pathway of opportunity to Manhattan and also the linkage between American and Italian cultures. The bridge, which is very close to the Red Hook community, is a constant reminder of American opportunity and industry. From the bridge, one can see the community below and, like the title of the book, one can see the entire community and seek greater abstract meaning from his viewpoint.Alfieri is symbolic of the person on the bridge looking down upon the Red Hook community or, perhaps, he is the bridge himself, allowing the people to cross into Manhattan and modern, intellectual American culture. Alfieri attempts to unite the American laws with Italian cultural practices and negotiate a place in between the two. Alfieri, narrating the story from the present looking back to the past, has the same vantage point as one looking from the bridge. After some time passes, he is able to process the events and see the greater societal and moral implications it has for the community as a whole. ItalyThe origin of the majority of the people in the Red Hook community, Italy represents homeland, origin and culture. What the country means to characters greatly varies. Catherine associates Italy with mystery, romance and beauty. Rodolp ho, on the other hand, is actually from Italy, and thinks it is a place with little opportunity that he would like to escape from. All of the characters, as much as love the benefit of living in the U. S. , still strongly hold to Italian traditions and identify it as home. Italy is the basis of the cultural traditions in Red Hook and unites the community in common social practices and religion.

Culture, Social Status and Identity in Viramontes' The Months and Essay

Culture, Social Status and Identity in Viramontes' The Months and Tan's Rules of the Game - Essay Example These stories are the same because they depict the cultural and social status of their characters, and the main protagonists want to mold identities that conflict with their society’s beliefs about womanhood, but they are different, because they discover dissimilar sanctuaries, where they can be, who they are, without being judged. These short stories are the same, because they portray the cultural and social status of the characters. The beliefs and practices of the protagonist in â€Å"The Moths† demonstrate that she comes from a conservative and patriarchal society. This society demands their women to be submissive and skilled in feminine tasks and values, such as crocheting. Her father, who she calls Apa, often gets angry with her, because she dislikes going to church. As part of their conservative and religious culture, they are expected to go to mass every Sundays, especially decent girls and women. But she does not does not like the church, because its â€Å"vas tness† makes her feel alone (Viramontes). Likewise, in â€Å"Rules of the Game,† Waverly’s Chinese is culture is very conservative, where hierarchies exist. On top of the family hierarchy are parents, who children will and should never disobey. When Waverly’s mother says this, she embodies the â€Å"strong wind† in her daughter’s life: â€Å"Strongest wind cannot be seen† (Tan). She cannot see her mother, who is always at her back, watching and commenting on her every move, not only in chess, but in real life. The social status of the characters is also evident in the settings of the story. The protagonist in â€Å"The Moths† lives in a place where superstitions are respected. Her grandmother mixes dried moth wings with Vicks to soothe her â€Å"bull hands† and shrink them back to normal size (Viramontes). Her grandmother also has stomach cancer, but they do not have money to pay for expensive therapies. Similarly, Waverl y lives in a poor community, although she is not aware that she is poor. They live on a â€Å"†¦two-bedroom flat that sat above a small Chinese bakery† (Tan). It signifies living in a cramped and controlled space, where Waverly cannot expect to express her freedoms. These stories are also the same, because the female protagonists challenge their cultures, in order to form their identities. The protagonist in â€Å"The Moths† does not believe in following cultural norms about womanhood. Instead of learning how to crochet, she learns how to plant with her grandmother. Her â€Å"bull hand† signifies that she does not fit with her society, because her personality, preferences, and beliefs oppose female stereotypes and Christian norms. When she smells the chile, she cries not only because of the chile’s spice on her eyes, but also because of herself. She is like a chile that hurts the feelings of her family, who wants her to be someone she is not. She is also compared to the â€Å"defiant† sun, because they both resist changing for others (Tan). When the sun meets the land during sunset, the union depicts that â€Å"endings† are windows to â€Å"rebirths† (Tan). But if she will be reborn, she will be the same pertinent and critical daughter that makes Apa angry and disappointed. Also, Waverly defies her culture, by becoming a great chess player and toppling every other man or boy she plays with. Moreover,

Assigment 5 Essay Example | Topics and Well Written Essays - 750 words

Assigment 5 - Essay Example The web studio 5.0 is one of the most recent and reliable Web Design Software (Fowler and Victor 5). The program is a creation of the Back To The Beach Software Company. The program also offers 30 days trail for interested customers. The 30 days trail involves full web design operation and function, free website hosting and technology support. Despite being cheaper, the program has numerous useful applications. Net Objects Fusion Essentials is also another useful website program. The program also offers free services for individuals who are interested in using website services. Some of the basic features of the program entail ecommerce tools, photo gallery, quick times, flash builder, and rollover images. The Trendy Flash Site Builder is one of the most effective and reliable web design software. By using this program, an individual has the capability of creating SEO optimized website that has stunning tools and graphics. The programs also has other reliable features that include unl imited customizations, music library, text effects, pay pal integration as well as premade web site design. Compared to other programs, the Trendy Flash Site Builder is relatively cheap and affordable. Apache web server software is also reliable and effective web design software. ... Despite offering better services to its customers the programs is also cheap to learn and maintain. FrontPage Web Design Program is also reliable web design software. In order to use the program, the user needs to pay for the services and secure a license of using its services. This program is also created and supported by companies that have he will of making huge amount of profit. Huge number people can also use the services of this program at one specific time. The program also has a support team that offers 24 hours services to its customers (Plumley and Warren 67). Paint.NET is also reliable web design software that is accessible to huge number of website users. This web design software is copyrighted software that is available for both personal use and for downloading importance programs from the website. This program is free but the frequent users of the programs are requested to pay small contribution for the maintenance of the program. After paying the required registration fee, an individual become a permanent member with the authority of effectively using the program. Among the six common webs design software, the Web Studio 5.0 is one of the most reliable web design software. This is owing to the fact that the program is easy to learn and manage. The maintenance cost of the program is also friend among all website users. The programs also has drag interface and it is easy to drop. The program is also fasters and facilitate easy creation of professionals website. This web design software has various features such as video tutorial, menu maker and PayPal shopping cart. However, despite being one of the most reliable web design software, the program is relatively expensive compared to other programs. In addition, the process of acquiring the programs

Australian-Indian Relations Essay Example | Topics and Well Written Essays - 1000 words

Australian-Indian Relations - Essay Example n this very arc of instability. As a result, Australia may be out of touch with the majority of issues in Southeast Asia, and because it has intervened but failed to cultivate these island nations toward a lasting peace, may have no bridge into the politics of South Asia or even the wonted East Asia region. From this perspective it may appear that Australia's relations with India and Pakistan are limited to the maximum. For decades, the reality has been just that, as the Cold War and Australia's association with the US have kept it at a distance from India. When India began testing nuclear weapons, it seems that Australia became even more opposed to deepening its relations with India due to India's failure to sign the non-proliferation treaty. However, India's relations with India at the present time due run much deeper than may be expected. For a brief period, the Australian government had agreed to supply India with uranium, which was an excellent deal for India considering Austral ia's vast holdings of uranium. Beyond simply cricket and uranium, the nations also shared a naval presence in the Indian Ocean as well as a shared diplomatic, economic, and political interest in the bulk of the Asian continent that lies to the east of India and to the northwest of Australia? region that neither country had given much attention to in decades past. Today, India's relationship with Australia falls into several areas. The first and foremost is a history of association with the British Empire, which in many ways paved the way for other aspects of the relationship. The English language is spoken in Australia, and probably spoken by even more people in India than the entire population of Australia combined. Furthermore, the two countries are the two largest democracies in the region surrounding East Asia, and particularly China as well as the Indian Ocean. Both have had growing ties with the United States during the years of the Bush administration and the War on Terror, a nd thus share many common military and defense goals? precursor for Australians brief increase of uranium supply for India. India and Australia are also economic partners, as both have strong and quickly developing economies. India, with its especially fast development, relies on Australia for the supply of raw materials, while Australia profits from such a supply and thus finds that its economy is strengthened by trade with India more than it is by other countries in South and Southeast Asia. Finally, India offers a democratic and secure alternative to trading with China, which has been known for nuclear proliferation. India and Australia also share an educational exchange, as many Indians look to Australia for English-speaking institutions of study, while Australians have sought to expand the existence of South Asian studies programs that focus on India. Indeed, the evidence exists to show that the relationship between India and Australia is one of note and great potential. The tw o countries recognize many common interests, and while they do not directly benefit one another's top agendas, they do have a mutually beneficial existence in regards to regional security, trade, immigration, education, and politics. Although these may be many aspects of an overall largely

Volunteer report Essay Example | Topics and Well Written Essays - 250 words - 1

Volunteer report - Essay Example I noticed that they had a timetable meal that ran from Monday to Sunday. Their food was excellent and for this reason I wished I would join them every day for a grasps of their meal. In addition, they have a playroom, mediation room, gym and many other utilities that prove useful to the families. The gym was used in for the purpose of refreshment after a long day. Staying fit was one of their key mottos. The main objective of the facility is not only to provide stability and resources for families in every part but also to keep families collectively to help kids heal and cope better. During my volunteering intern at the facility, I was accompanied by other interns, Chef Mishel together with other dietetic interns who were well experienced with their work. Together, we cooked a meal for the families and I was able to serve for some of them in the facility. Their shined with glamour a proof that our meal was splendid. I was so happy and wished this happened frequently. I interacted with various families at the facility most of which were children, and it was incredible to learn about where they were from the families they came from. In addition, I played games with the children in the playroom and worked out in the gym, something that made them jovial. Actually, those families and children were the best people to interact with. Without forgetting to mention, the families pointed out that there were various groups that came from Monday through to Friday to cook meals for them. The children said that they appreciated their efforts to deliver services for it shows how much these people are concerned with their well-being. It was so amazing to notice that there were other volunteer groups that were mostly interested in the volunteering act for it takes a lot for a person to do such work. These children and families need to get their minds off from the

Corporate Social Responsibility Essay Example | Topics and Well Written Essays - 1000 words - 1

Corporate Social Responsibility - Essay Example I have to admit that my knowledge about ethics prior to the course was limited. I only knew it was important and my understanding was limited to generalize idea such as â€Å"we should always strive for the right thing to do† and being ethical is always desirable. I came to the realization that ethics was important because I was aware that the recent financial crisis that rocked the world that made lives difficult for everybody was rooted in greed and lack of ethical practice in business. This explains why I chose to write about this topic because the exercise affords me the opportunity to examine the ethical aspect of business which is often neglected. I believed that this is important to learn especially when we are still in the academe and still in the process of equipping ourselves the necessary skills and knowledge so that it will be ingrained within us to become better professionals in the future. The lessons that we will learn would guide us when we make our choices in any ethical dilemma that we would confront, and would run business organisations in a corporate responsible manner. I believe that given the recent scandals that rocked the business and financial world, it now becomes an imperative that each individual entering into the corporate and financial industry must have a strong sense of corporate social responsibility or accounting to avoid similar occurrences in the future. It should begin right in the academe where future professionals, employees or entrepreneurs are being trained and prepared. It is now important because the neglect and disregard for ethical practice in business has contributed to the recent financial and mortgage breakdown that stemmed from greed and lack of ethical practice that made life difficult for everybody. The high incidence of unethical practices in modern business has prompted a stream of organizational research about morality in business1. In fact, industry experts such as Ernst & Young has pointed out that unethical business practice is the main culprit that precipitated the recent economic crisis which caused a lot of jobs and homes to be lost that made life difficult for everybody which is why it is now an imperative not only to integrate but also to stress corporate responsibility and audit beginning in the academe when future business professionals are being trained and prepared. The obvious disregard about proper corporate conduct is not surprising as Crane and Matten hypothesized that business in itself has been argued to be amoral that to put ethics in business is an oxymoron because they contradict each other2. Business in pursuit of its profit motive will invariably set aside ethics as it endeavour to make profit. Actions which may be considered unethical such as lying and deception may even become permissible in the business’ pursuit for profit3. This is consistent with the consequential normative ethic theory that â€Å"holds that the moral rightness of acts, which holds that whether an act is morally right, depends only on the consequences of that act or of something related to that act, such as the motive behind the act or a general rule requiring acts of the same kind4†. In plain language, a business person may be prompted to choose a certain course of action or inaction based on the benefit or the avoidance of harm that may be derived from such action or inaction. In the case of business, it can chose to shun any propriety in conducting business with the idea that it is more expedient to make profit by disregarding scruples in conducting its operation. Having corporate responsibility does not mean that a business organisation is already shunning the importance of profit. Profit is equally important for without it, business

Analysis of the Sources that Explained Mesopotamia in Preindustrial Annotated Bibliography

Analysis of the Sources that Explained Mesopotamia in Preindustrial Era - Annotated Bibliography Example The problems will be linked to the economic and social wellbeing of the country. They will also be linked to the increasing settlement in the region with the focus being on how this article describes early settlement. The social problems experienced are directly linked to urbanization which will be detailed upon by the articles. The aim of the article will be to provide information that would describe earlier settlement. The article will give details on how the problems affected settlement in the city. This will also detail how it also affected the structural design of the city. The article also explores models designed by preindustrial Mesopotamia in curbing these social problems. The article also explores the manner in which the two rivers bordering the city where effecting while constructing the city and at the same time sustain life within the city. The focus will be to highlight the factors that contributed to the problems and the solutions offered by the dwellers within the cit y. There is a need to focus on human geography. This source will detail the population distribution of the region and at the same time focus on the economic activities of the region. The aim will be to determine the human element in the existence of the city and how different cultures coexisted within the city. The focus will be on how resources were distributed within the city. The aim would be discussed the population growth and to determine how this contributed to the expansion of the city. The connections between human population and the citizen of the city will be focused upon. The migration patterns and the population of the neighboring cities will be focused upon. The factors that enhanced the migration will be discussed. This will be compared to the available economic activities within the region. The article will detail what resources were utilized during the development of the city.  

Effects of Cell Phone on Media Essay Example for Free

Effects of Cell Phone on Media Essay The introduction and use of cell phone devices or technologies has transformed everyday practices of people. The role of cell phones the so called portable media devices has gone beyond communication where they are used in complicated multimedia hybrids, personal digital assistants that is PDAs, MP3 players, personal media centres and playing of games (Cary 17). This work therefore examines the effects of cell phone on media together with related or associated issues such as how they are changing the way people interact through watching televisions, advertisement and even reading of articles. Cell phone is being used by people in accessing email and web interface, as game device, MP3 player and digital video camera. The most common one is where people have used the mobile phones to access internet. There are also a number of cell phones that can receive television broadcast over the cellular network. Such cell phones are called phone-game hybrids and include: Nokia’s, N-Gage QD and Samsung’s new arrival that is the SCH-V450 and the Digital multimedia broadcasting handsets (Goggin 39, 2004). Mobile phones have also played a major role in communication, cultural studies and urban design where they are primarily considered as carrier of message or voice-carrier and text message transmission device. In this way cell phones have helped in carrying out advertisements. However, since the current media environment is evolving beyond the primary role of passing information, they are nowadays engaged in a number of functions in which many people view them as Sociotechnical devices, portable and interactive techno spaces which in turn form a variety of media-forms (Gatens 48 and Marvin, 26). Read more:Â  Harmful Effects of Mobile Phones on Students This makes cell-phone become devices which are not only viewed as telecommunication tools but also as transmedia tools. The message being conveyed here is that cell phones are considered both as communication tools and info-mediatic collections within which the technologies and practices of communication, information and media normally interact together. A part from carrying out communication or passing information, cell phones have also been in playing games, taking photographs and downloading materials such as polyphonic ring tones (Everett and Caldwell 53). This has been by the wireless application protocol (WAP) with I-mode technology that enables individuals using cell phone find it easy in downloading materials from the internet using their mobile phones. This was recently launched by the Japan Company called DoCoMo. The use of cell phones in watching news and movies has brought a lot of problems especially on the media industry. The cell phone industry has manipulated the scientific world where pornographic pictures are watched, news and other programs watched on television (Rheingold 175). Customers are lost by the media industry however this has not been proved. . The media industry has raised a lot of question on the problem posed to them by the cell phone industry. The industry looks at the cell industry to be making a lot of money since they loose their customers to them.. Entertainment nowadays can be done through cell phone. Most of the youths more so the adolescent who are the major customers of media industry are nowadays attracted by the cell phone industry (Cary 18, 1992). Games such as Gambling, electronic games, casinos, pod casting and music can be listened to using the cell phones. Cell phone has also promoted business activities. Market research, industry analysis broadcasting and even publishing are carried out using cell phone. Business men and entrepreneurs nowadays use cell phone to advertise their business. This shows that they have shifted their ways of promoting their business through T. V to mobile phones since most people own mobile phones with internet; it is easier for them to access or see the advertisement the moment they log into the internet. Media industry such as televisions that normally offer these programs increasingly face stiff competition from the mobile industry. The use of cell phone in reading novels has made it be referred to as a portable communication media and collection or convergence of technologies. As people use cell phones for reading novels it not only changes the reading habits of people but also changes other media. (Rheingold 161) For example the cell phone novel known as the deep love which was first published as text message was published as a book later(Kasesniemi18). The novel was later on produced and filmed as a movie then made into a television show. Even through the process of changing the cell-phone novel to a book, movie and into television show does not create a new medium. It has also affected other media at the same time. All the other technologies have been merged or conveyed together because of the cell phone (Levinson 132). .Conclusion The effect of cell phone on media is notable in every life. Rheingold (16, 2002) describes cell phone as a handheld communication tool that merges different technologies together. Some of the effects have been noted in reading and downloading of articles online. Online games can be played by the use of phones, movies and news that were initially watched on T. V screens can be watched using cell phones. This has brought a lot of problems on the media industry. As a matter of conclusion it can be said that cell phone has affected the media industry such as movie, film and television in a number of ways, which have been discussed above. Works Cited Crary, Jonathan. Techniques of the observer: on vision and Modernity in the nineteenth century. Cambridge; Mass: MIT Press, 1992. Crary, Jonathan. Suspensions of perception: attention, spectacle and modern culture. Cambridge, Mass: MIT Press, 1992. Everett, Anna and Caldwell J. T (Eds) Theories and Practices of Dijitextuality: New York: Routledge, 2003.

Othello the Manipulator Essay Example for Free

Othello the Manipulator Essay Shakespeare’s Othello: Iago, the Master Manipulator William Shakespeare’s â€Å"Othello† is a play consumed with deception, jealousy, and revenge, mainly caused by a powerful â€Å"villain† named Iago (1. 1. 28). Although Iago presents himself as everyone’s honest friend, he is always trying to manipulate and deceive them, as shown in his words â€Å"Whip me such honest knaves† (1. 1. 50). This heartless character even manipulates everyone around him including his companions Cassio, Rodrigo, and the Moor, Othello intending to gain power. His actions create a massive amount of jealousy and rage. All of this revenge and manipulation first forms when Cassio is chosen for the position as Othello’s Lieutenant, a job which Iago wanted desperately. This sends Iago into a rage motivated by his hunger for power. His revenge towards Cassio first begins at a celebration when Iago pressures him into having one drink after another knowing Cassio has a low tolerance with alcohol. Under pressure, Cassio argues, â€Å"Not tonight, good Iago: I have very poor and unhappy brains for drinking: I could well wish courtesy would invent some other custom of entertainment† (2. . 1164-1167). Iago’s perfects his manipulation by taking advantage of other’s weaknesses. Iago manipulates both Cassio and Rodrigo into fighting each other which results in Othello taking away Cassio’s title as Lieutenant. Using Cassio’s statement, †She’s a most exquisite lady† Iago is able to use this to conjure a second mastermind plan to have Cassio’s rep utation ruined by convincing Othello that Cassio and Desdemona are having an affair (2. 2. 1152). Although Iago seeks revenge from Cassio for gaining Iago’s desired position as Lieutenant, his main interest of destruction is the Moor Othello, which is the masterpiece of Iago’s many manipulative plots. Iago uses Othello’s beloved wife, Desdemona, to take advantage of Othello’s weakness. Iago implies, â€Å"Cassio my lord? No, sure, I cannot think it; That he would steal away so guilty-like, Seeing your coming† (3. 3. 1668-70). Iago’s coy assumption of Cassio overcomes Othello, making Othello think Iago is an honest friend he can trust. This gained trust makes Iago’s plans of destruction much easier to accomplish. Iago, also, makes Othello overhear a conversation between Iago and Cassio, which he believes he is about Desdemona, when in fact their conversation is about Cassio’s prostitute Bianca. As the two men laugh and tell sexual stories, Othello goes into a jealous rage, at the thought of Cassio having these relations with Desdemona. Iago multiplies Othello’s rage as he talks about the situation, â€Å"Did you perceive how he laughed at his vice? † (4. . 2602). He convinces Emilia to take Desdemona’s handkerchief, which was Othello’s first significant gift to her. Iago sets the situation up so that the sacred handkerchief will be found in Cassio’s room, and later is given to Cassio by Bianca in front of Othello. As Iago pumps more deceitful lies of Cassio and Desdemona’s affair into Othello’s head, Iago says, â€Å"And did you see the handkerchief? à ¢â‚¬ ¦and to see how he prizes the foolish woman your wife! She gave it him, and he hath given it his whore† (4. 1. 2604-08). Othello, having seen this will have all the evidence he needs to suspect Cassio of the affair. Iago then manipulates Othello into killing his loyal wife by suggesting, â€Å"Do it not with poison, strangle her in her bed, even the bed she hath contaminated† (4. 2. 2638-39). Iago’s over whelming hunger for power is also shown though his best companion, Rodrigo, whom is also in love with Desdemona. Discovering that Desdemona and Othello are married, frantic Rodrigo confides in Iago and asks, â€Å"What should I do? I confess it is my shame to be so fond; but it is not in my virtue to amend it† (1. . 673-676). As a master of deception, Iago proves to Rodrigo that Desdemona’s heart will be easily won by his lavish expensive gifts. With Rodrigo’s excessive amount of savings, Iago purchases these gifts that are intentionally for Desdemona and sells them for his profit. Secondly, Iago convinces Rodrigo into thinking that Cassio and Emilia are having an aff air. Iago manipulates Rodrigo into fighting Cassio at the celebration. Iago persuades Rodrigo by saying, Watch you to-night; for the command, I’ll lay’t upon you. Cassio knows you not. I’ll not be far from you: do you find some occasion to anger Cassio, either by speaking too loud, or tainting his discipline; or from what other course you please, which the time shall more favorable minister (2. 1. 1064-70) In conclusion, Iago’s deception and manipulation plan to gain power completely fails as everything falls to pieces. When Iago’s wife, Emilia, reveals Desdemona’s loyalty to Othello and all of Iago’s lies, it is far too late. After Othello murders his wife, he finds out all of Iago’s â€Å"honest words† were all lies and catches Iago in the act. In the final scene, Iago says, â€Å"Demand me nothing: what you know, you know: from this time forth I never will speak word† (5. 2. 3665-66). In the end, Iago manipulated everyone around him so he could gain personal power. However, his selfish goal of power is never reached and nothing is gained from Iago’s manipulative actions. Iago’s excessive lies and actions show that he is the main cause for so many problems containing deception, jealousy, rage, and revenge. Work Cited Shakespeare, William. The Tragedy of Othello, the Moor of Venice. The Norton Shakespeare: Tragedies. 2nd ed. Ed. Stephen Greenblatt. New York: W. W. Norton, 2008, 425-507.

Distress and Quality of Life of Type 2 Diabetic Patients

Distress and Quality of Life of Type 2 Diabetic Patients The present study measured the Distress and Quality of life of type II diabetic patients-of the two groups, group 1 and Group 2. It also assessed the correlation between Distress and Quality of life and their subdivisions such as, the correlation between Distress, emotional distress, physician distress, regimen distress, interpersonal distress; Quality of life, energy and mobility, diabetes control, anxiety and worry, sexual functioning and social burdens using Pearson’s correlation. This study also measured the difference in Distress and Quality of Life between group 1 and group 2. The first objective of the present study was to measure the Distress and Quality of life in type II Diabetic patients. This was done by using two scales, Diabetes Distress Scale (DDS17) and Diabetes 39 (D39). The frequencies and normal distribution of Distress among group 1 and group 2 shown in Figure 1 portray that there is high Distress among the participants in group 1 than in group 2; where high score indicate high Distress. Similar findings were found in a study done by Fisher, Skaff, Mullan, Arean, Glasgow Masharani (2008), an increase in distress upto 60% was present over a period of time. In Figure 2, the frequencies and normal distribution of Quality of life of group 1 and group 2 were shown which portrays that group 2 has higher Quality of Life than group 1, where low score represents high Quality of life. The second objective was to find if there exists a correlation between Distress and Quality of Life. Research review shows that there was a significant relationship between Distress Quality of life (Wu, Huang, Liang, Wang, Lee Tung, 2011). Owing to the scoring pattern, the present study showed similar results with a positive correlation between the scores of Distress and Quality of life i.e., higher score of Distress and high score of Quality of Life. However, it is to be interpreted as a negative relationship between distress and quality of life as is implied by their scoring pattern, where higher scores in distress represents higher distress whereas higher scores in quality of life represents lower Quality of life. Thus, it may be interpreted that higher the Distress, lower the Quality of Life and there was a relation established between higher Distress and Lower Quality of life. The third objective of the study was to find the difference between group 1 and group 2 of Distress and Quality of life, to find the difference between participants practicing faith based yoga as a complimentary intervention aside from the allopathy medications and participants just using the medication. There were many previous studies showing, certain management techniques have a great impact on controlling the blood sugar levels (Singh, Tandon Sharma, 2005). It was found that the Distress among group 1 was high compared to group 2. Same trend was demonstrated in all the dimensions of Distress such as emotional distress, physician distress, regimen distress and interpersonal distress. similar finding were reported by Sharma, Sen, Singh, Bharadwaj, Kochupillai Singh (2003), where type II Diabetic patients practicing sudarshana kriya were found to be experiencing low level of stress. Though both the groups differed significantly in all the dimensions of distress, the difference bet ween the groups was higher in the emotional distress dimension. As indicated by the earlier studies such as those by Snoek Polonsky (2000); Rock (2003); Pouwer (2009) that individuals diagnosed with Diabetes have emotional disturbances due to various reasons such as medication, frequent visits to hospital, comorbid conditions of Diabetes etc. Going by the dimensions of Distress, high Distress was found to be in the dimensions of Emotional Distress, followed by regimen distress, physician distress and interpersonal distress in group 1. As there was a correlation seen between Distress and Quality of life, the same was reflected in the results where group 2 had better Quality of life than group 1, where high score represents low Quality of life. Going by the dimensions, group 2 had higher Quality of life in the dimensions of energy and mobility, social burdens, diabetes control, sexual functioning and anxiety and worry. This is in accordance to the previous finding which state that there was an improvement in the Quality of life in people diagnosed with type II Diabetes who were practicing yogic breathing techniques, sudarshana kriya and pranayama (Jyothsna, Joshi, Ambedkar, Kumar, Dhawan Sreenivas, 2012). The complimentary management technique use not only gives the patients physical relaxation but it also gives them the psychological relaxation. Hence, they might act upon the lowering of Distress and higher Quality of Life of the patient. This complimentary technique gives physical, psychological as well as social outcomes. Physical outcomes are described by medical literature in multiple ways. Psychological outcomes are seen in terms of relaxation and as seen in the outcomes of lowered distress and enhanced quality of life. Togetherness with people with similar diagnosis doing an effort to manage the disease condition might contribute to the social angle. Thus, the complimentary management technique used by the group in the present study seems to have contributed effectively as indicated by low Distress and better Quality of life and their dimensions. The importance of Art of living in decreasing the Distress and enhancing the Quality of Life has been understood. Many studies have also kept forward their view on the benefits a person could achieve following Faith based yoga. As mentioned earlier by many of the physicians across the globe, Faith based yoga can be an effective intervention complimenting the allopathy medicine. Therefore, this study can contribute to the existing studies supporting this view where people can decrease their Distress and enhance their Quality of life and their dimensions to effectively control Diabetes. Shortcomings and future directions The major shortcoming of this study is the sample size, larger sample would have provided better representation of the characteristics of the population. Another major shortcoming of this study was administering the scales in group (in the Art of living centres), this could have prompted the participants to give socially desirable responses. Future recommendations of this study would be to compare the participants practicing Art of living above 10 years and below 10 years, this would give more insight on the long term effects of practicing Art of Living. Future research may also be conducted comparing the impact of various forms of Faith based yoga such as Brahma kumaries, Christian Yoga, Vipasana etc. on type II Diabetic patients. Study would have yielded clearer results if there was a pre and post interventional design. That is measurement of Distress and Quality of Life on participants before they practiced Faith based yoga and after practicing the same for a considerable period o f time such as one year or more. This would have yielded a clear effect of faith based yoga. Further research may be conducted in this direction.

The Importance of Language in Richard Wright’s Novel, Black Boy :: Wright Black Boy Essays

The Importance of Language in Richard Wright’s Novel, Black Boy Words are powerful things. They can be used to construct or destruct. In the novel Black Boy, Richard Wright discovers this fact after reading inspirational works written by a man named Mencken. It is at this point in his life where he understands the importance of words. Wright qualifies the idea that language is an important key to identity and social acceptance using figures of speech and warrants. A rhetorical technique used by Wright is this passage is that of metaphors. For example, when describing Mencken’s effectiveness he uses phrases such as â€Å"he was using words as a weapon.† This simile conveys to the reader just how powerful the new experience was for Wright. Richard wondered if he would ever be able to create something so significant. Although the idea seemed frightening at first, Wright was able to fight using his words in the end. In addition, to extend the metaphor of words being weapons, the language on the page is so full of disgust that Wright imagines Mencken had â€Å"slash[ed] [it] with his pen.† This image gives convincing evidence that Mencken was extremely irate with his society. His sword is the pen and his words are the blow. Those who are witness to this ‘duel’ are those who are effected by its cuts. Readers begin to realize just how important language is to identity and beliefs. Richard Wright utilizes evidence to create an ethos appeal for his readers. For instance, he doubts his literary choice once he reads the title of the book given to him: Prejudices. In his personal experience those that had spoken this word were not entirely right, according to him. He toys with the idea that this man (Mencken) is mistaken; he, himself, looked to have been mistaken. Wright made an unjustified conclusion about this writer judging by the single word on the cover of a book. If one word could bring up such emotion from this boy, imagine what a whole slew of these words would create in their wake. Mencken was not accepted by his race due, impart, to his beliefs.

Personal Narrative: Teaching Others How I Write Essay -- Narrative Ess

For as long as I can remember, I have always enjoyed writing. Writing is an opportunity for me to express my thoughts and feelings while helping me grow to understand who I am as an individual, a student and furthermore, a future teacher. Yet, if someone were to ask me how I do it, I am afraid I could not give him or her a clear and precise answer. Trying to find that answer almost seems harder for me than the actual writing process itself. However, after having done my student teaching last semester, I have learned that modeling my own writing for the students not only helps them to see more clearly how I write, but helps me understand how I write as well. My first student teaching experience took place in a seventh-grade English classroom during the second half of the school year. The first couple of weeks gave me an opportunity to observe both the teacher and the students participating in various writing activities. One assignment in particular asked the students to choose a topic of interest and write down on paper all the information that they already knew about this subject. A simple assignment, right? Sitting off to one side of the classroom, I decided to attempt the assignment. On the top of my paper I wrote the word "athletics". Under it, I wrote about why I chose the topic, what it meant to me and how it has played a crucial role in my life. Before I knew it, I had covered one and a half pages with information. When the time was up to stop writing, I looked around the classroom and noticed some of the students appeared a bit confused. The assignment was not a difficult one, not for me anyway. When the teacher began asking students to share what they had written with the class, it was interesting to find that only a... ...n my life. On that day, I learned that the aspects of knowing how to do something and knowing how to teach it are different indeed, but when they are intertwined, good things can happen. As a teacher of writing, I realize from my experience already that I need to take a step back and allow my students some room to breathe, some room to think, possibly a model writing and an opportunity to pick up their pencils without any fears or confusion and simply write. They need to believe in their own feelings, their experiences and their own knowledge of the world around them and learn to tap into them. Without this exploration, students will remain stuck sitting with that same blank piece of paper in front of them. As a future teacher of writing, I will explore my writing by working alongside my students. I am simply amazed by what I have learned from this process already.

Prepared Remarks of President Barack Obama: Back to School Event

On the 8th of September 2009, President Barack Obama held a speech at Wakefield High School in Arlington, Virginia, in which he stressed the importance of education. The speech was broadcasted nationally and students were tuning in all across America, kindergarten through 12th grade. His speech makes it very clear that you simply cannot quit school and skip classes because â€Å"you’re not just quitting on yourself, you’re quitting on your country†.President Obama would like to motivate all the students who were listening and that feeling of importance, which the sentence above is showing, might be the exact motivator for that to happen. This paper will analyse and comment on the speech and focus on the way President Obama addresses his audience. The composition of the speech is pretty much straightforward and not problematic nor complex. It is started by a short presentation followed by the message of the speech, well-documented with different arguments which su pport each part of the message.It ends with a short summary which sums it all up. This is a necessity given the fact that the audience is – as mentioned – students of all age. His language is very easy to understand and he doesn’t use neither imagery language nor hypotactic sentence structure where he referrers to something that isn’t mentioned. If this wasn’t the case, large parts of the audience might not understand the message the speech is trying to show, and the speech would be useless for them.Since the audience is a group of students – large amount in a small age – he tries to make himself likeable. This is seen in the anecdote about his own childhood and hard upbringing. Throughout the speech, President Obama takes great use of pathos as a persuasion mean which means that he appeals to both emotions and feelings: â€Å"And even when you’re struggling, even when you’re discouraged, and you feel like other people have given up on you – don’t ever give up yourself. , President Obama is using pathos as the main way of persuasion since people are more likely to agree when they’re emotional. There are, however, several places where he appeals to ethos by expressing his own equality to the rest of the audience: â€Å"[†¦] how’s everybody doing today? †, as he opens the speech in this way, he sets the scene and tries to get rid of his authority as the most powerful man in the world since no one likes to be talked down to. President Obama mentions all the different grades of the same reason; he doesn’t want to talk down to them.President Obamas main point is that all students have to work hard in order to reach success and get a good education. Education is the only â€Å"real† way out of poverty, unemployment and trouble. His argument for this statement is that without an education and hard work, you can’t be something in life; jobs and money doesn’t come from nothing, even though several Hollywood-movies and TV-series might express that. Furthermore, he stresses the importance of responsibility.Not only for your own actions, but also for the responsibility your teachers should to inspire you, your family to support you and make sure you stay on track, and the government’s responsibility for setting high standards and provide whatever it takes to raise the bar for educational standards. However, all of this doesn’t mean much if you don’t take the responsibility of yourself and your education. He describes how every single one of us has something to contribute: â€Å"Every single one of you has something to offer†.Hereafter he even gives several examples of opportunities which might occur for someone who has found her/his hidden talent. This also referrers to the â€Å"don’t quit, don’t skip, stay in school† message he’s trying to embrace. The next part of the speech is once again used to make President Obama identifiable. He knows how hard life can be, since he himself had to break the negative heritage; his parents didn’t have an college education and didn’t have much, however, â€Å"That’s no excuse for not trying. †, he says. There is, in fact no real excuse for quitting school.He even mentions the American Dream in his speech which is based on the belief that everyone is their own happiness and future. He mentions 3 different people, who have been struggling; nevertheless, their future seems to be bright after their hard work! This is yet another motivator and proof for the people who think their background and personal issues sets them behind. Barack Obama uses a lot of different rhetorical techniques in order to create an environment in which his young audience feels comfortable in; furthermore, it makes his argumentation a lot more convincing.In lines 164-165 he keeps repeating â€Å"I expect [à ¢â‚¬ ¦]†, which sets the bars for the upcoming year. I believe he does this because he has an authority. As much as he tries to hide it, he also uses it. If it was a general John Doe who said â€Å"I expect this and that from you†, what purpose would it have? The audience wouldn’t listen! You could say that Barack Obama is a role model for a lot of people – if not a whole nation: he’s the first black president and worked his way up from nothing. President Obama is rying to make the distance between him – and his authority – and the audience as small as possible by making a lot of comparisons and relations. The words â€Å"I get it† and â€Å"I know† is not put there for no reason. By decreasing the gap between him and the audience, his authority is more in the background, and he is now a person whom you can relate to, and not the most powerful man on the world. In America, national sentiment isn’t very uncommon, an d the responsibility which a lot of people feel toward their country is a mean to motivate people.Therefore, the argument: â€Å"you’re not just quitting on yourself, you’re quitting on your country† is one powerful motivator. I feel that the speech is indeed influenced by American thinking, however, it all makes sense; even in my head. He stresses the importance of education, and that is something each and every country has a necessity to do; perhaps he has found the way to actually communicate the message? ——————————————– [ 1 ]. line 65 [ 2 ]. line 147-149 [ 3 ]. lines 36-37 [ 4 ]. lines 92-107 ï » ¿Prepared Remarks of President Barack Obama: Back to school Event One of the most important and discussed topics in politics has always been education because of its decisive role in society. Education is the key stone for the generations to come and well educated citizens are a necessity for a successful society in the 21st century. Politicians also make education a high priority because they know it is where votes can be drawn. A politician who also is concerned about the matter of education is President Barrack Obama. And in his speech â€Å"Prepared Remarks of President Barack Obama: Back to School Event† held in Arlington, Virginia on September 8, 2009, he addresses to the Americans students the importance of education and emphasizes that the responsibility to do well in school lies with the students themselves.This is a responsibility that they have to meet, not only for their own sake but for the sake of their country. President Obama emphasizes the importance of education and self-responsibility to children from kindergarten to 12th grade. Children at that age can be difficult to address to, especially with such a big size of group, so Obama must use various approaches to make it possible. He talks to them as an equal so young audience can identify with him and not only see him as the President. He uses a simple and informal language with many repetitions and examples they can relate to. He starts out by saying â€Å"Hello everyone – how’s everybody doing today?†(Page 1, line 1). He speaks directly to the audience to get their attention.He needs the attention from the children and hold on them to get through with his message. He does that by gaining their respect for him and shows that he sincerely cares about them. In the beginning of the speech Obama tells about his story from when he was young. How he was raised by his mother who did not had any money to take him to school, so she had to give him lessons at home at 4:30 in the morning. He also mentions things he did he is not proud of th at got him in troubles. Then Obama shares and opens up about his personal stories, he uses ethos in his arguments to increase his reliability with the audience. It makes it easier for Obama to get through with his message when the people he talks to have his respect.Obama starts stressing his message after he has achieved the audience’s attention. Obama has two main messages in his speech. The first one is that the self-responsibility of the education lies with the student. Maybe the  parents and the teachers also have some responsibility for the student, but it all comes the student â€Å"none of it will matter unless all of you fulfill your responsibilities†(Page 2, line 30). The students will not have everything served for them; it is their turn to take action and take responsibility for their choices. The second one is that the students also have a responsibility for the nation. The nation depends on the students to get a well education.The future of the nation l ies with the students to be a functional part of the US society so the nation can operate and compete â€Å"What you’re learning in school today will determine whether we as a nation can meet our greatest challenges in the future.†(Page 2, lines 52-54). Obama is addressing to the students patriotic American inside them. Most American is raised to be patriotic and Obama knows hot to make use of it. Everybody wants to be a part of something that has an influence on the nation, and every student has the responsibility to their nation â€Å"We need every single one of you to develop your talents, skills and intellect †¦ If you don’t do that – if you quit on school – you’re not just quitting on yourself, you’re quitting on your country.†(Page 2, lines 62-64).Obama begins to speak about how hard work is the most important key to success. Everybody has the opportunity to succeed. Here he indirectly refers to the American Dream; w ith hard work you can accomplish everything. â€Å"Where you are right now doesn’t have to determine where you’ll end up. No one’s written your destiny for you. Here in America, you write your own destiny. You make your own future.†(Page 3, lines 88-90).He uses himself and Michelle Obama, the first lady, while using pathos as examples of people who started from the button with bad conditions and build up to become successful. He comes up with three other cases than himself:  Ã¢â‚¬Å"Jazmin, Andoni and Shantell aren’t any different from any of you. They faced challenges in their lives just like you do. But they refused to give up. They chose to take responsibility for their education and set goals for themselves. And i expect all of you to do the same†(Page 4, lines 105-107)Obama uses the sponsorship effect to create ethos. He also uses Michael Jordan’s and J. K. Rowling’s story to get it out that you cannot succeed without fail ing. Obama uses persons who are idol to many so they get inspired to try to accomplish the same success. He wants the students to understand that if they want to be successful, they need to set goals for themselves and take responsibility for their education for that to happen. Throughout the speech, Obama uses a number of different strategies to affect the broad group of audience. By use concrete example they can relate to with a language everybody is able to understand, he inspires and motivates the young people who is the future of the USA.

Physics Study Notes Hsc

Physics Summary Contents Core Topic One: Space 1. 2. 3. 4. Gravity Space Launch and Return Future Space Travel Special Relativity 2 3 13 14 Page Core Topic Two: Motors and Generators 1. 2. 3. 4. 5. The Motor Effect Electromagnetic Induction Electric Generators Transformers Electric Motors 19 24 27 29 31 Core Topic Three: From Ideas to Implementation 1. 2. 3. 4. Cathode Rays Quantum Theory Solid State Devices Superconductivity 32 37 43 48 Option Topic: Quanta to Quarks 1. . 3. 4. 5. 6. Models of the Atom Quantum Physics The Electron Microscope Applications of Radioactivity Nuclear Applications The Structure of Matter 53 57 59 61 66 67 William Kim HSC Physics Summary | page 1 Core Topic One: Space 1. The Earth has a gravitational field that exerts a force on objects both on it and around it  § Define weight as the force on an object due to a gravitational field The weight of an object is the force of gravity acting on it. r W = mg Where W is the weight in newtons (N), m is the mass i n kilograms (kg) and g can be either: 1. The acceleration due to gravity (= 9. 8 m/s/s at the Earth’s surface); or 2. The gravitational field strength (= 9. 8 N/kg at the Earth’s surface).  § Define gravitational potential energy as the work done to move an object from a very large distance away to a point in a gravitational field. As we lift an object from the ground to a height above the ground we do work on it. This work is stored in the object as gravitational potential energy.For an object of mass m at a height h above the Earth’s surface the gravitational potential energy E is given by: E p = mgh However this equation is valid only when the object is near the Earth’s surface. The gravitational potential energy is a measure of the work done in moving an object from infinity to a point in the field. The general expression for the gravitational potential energy of an object of mass m at a distance r from the centre of the Earth (or other planet) is g iven by: E p = ? G mM E r Newton’s Law of Universal Gravitation m F = G 12 2 r where G is the universal gravitational constant. The Gravitational Field Surrounding any object with mass is a gravitational field. g= Gm r2 Where M is the mass of the Earth (or other planet). Change in Gravitational Potential Energy The change in potential energy of a mass m1 as it moves from infinity to a distance r from a source of a gravitational field (due to a mass m2) is given by: mm ? E p = G 1 2 r Change in Gravitational Potential Energy Near the Earth (when radius increases from A to B) ?1 1? ?E p = GmM E ? ? ? ?r ? ? A rB ? William Kim HSC Physics Summary | page 2 . Many factors have to be taken into account to achieve a successful rocket launch, maintain a stable orbit and return to Earth  § Describe the trajectory of an object undergoing projectile motion within the Earth’s gravitational field in terms of horizontal and vertical components Any moving object that moves only und er the force of gravity is a projectile. The horizontal motion of a projectile is independent to the vertical motion. The reason for this result is that gravity is the only force acting on the objects and this always acts towards the centre of the Earth.Projectile motion can be analysed by realising that: 1. The horizontal motion is constant velocity. 2. The vertical motion of constant acceleration (with acceleration of g). Equations of Uniformly Accelerated Motion r r r v = u + at r r 1r s = ut + at 2 2 2 2 v = u + 2 as The Path of a Projectile The velocity at any point of the path of a projectile is simply the vector sum of the horizontal and vertical velocity components at that point. ?y = k (? x ) 2 ? ag ? k =? 2 ? ? 2u ? ? x? The horizontal component is constant.The vertical component changes at g, the acceleration due to gravity. Trajectories The path followed by a projectile – its trajectory – is a parabola (or linear) (1) Horizontal motion: ? x = u x t 1 (2) Ve rtical motion: ? y = a g t 2 2 From (1): ? x t= ux Combining (2) & (3): 1 ? ?x ? 1 ag ? y = a g ? ? = (? x )2 2 ? u ? 2 ? x? 2 ux 2 ux ? y ? x William Kim HSC Physics Summary | page 3  § Describe Galileo’s analysis of projectile motion Galileo was responsible for deducing the parabolic shape of the trajectory of a projectile.Galileo’s analysis of projectile motion led him to consider reference frames. These are what all measurements are compared to. The concept of Galilean relativity refers that the laws of mechanics are the same in a frame of reference that is at rest or one that moves with constant velocity.  § Explain the concept of escape velocity in terms of the: o gravitational constant o mass and radius of the planet If an object is projected upward with a large enough velocity it can escape the gravitational pull of the Earth (or other planet) and go into space.The necessary velocity to leave the Earth (or other planet) is called the escape velocity. Escape velocity depends on the gravitational constant, the mass and radius of the planet. Suppose an object of mass m is projected vertically upward from the Earth’s surface (mass of M and radius R) with an initial velocity u. The initial mechanical energy, that is, kinetic and potential energy is given by: E k i + E pi = 1 M m mu 2 ? G E 2 RE Let us assume that the initial speed is just enough so that the object reaches infinity with zero velocity.The value of the initial velocity for which this occurs is the escape velocity ve . When the object is at infinity the mechanical energy is zero (the kinetic energy is zero since the velocity is zero and the potential energy is zero because this is where we selected the zero of potential energy). Hence 1 M m mve2 ? G E = 0 which leads to: 2 RE ve = 2GM E RE William Kim HSC Physics Summary | page 4  § Discuss Newton’s analysis of escape velocity Circular Motion The motion of an object in a circular path with constant speed is cal led uniform circular motion.Although the speed remains the same in uniform circular motion, it follows that an object travelling in a circular path must be accelerating, since the velocity (that is, the speed in a given direction) is continually changing. r r v1 ? v2 v1 = v 2 r v2 r The change in velocity is given by: v2 r r r r v1 ? v = v 2 ? v1 r ? v1 r r ? v r and since: a = ? v r ? t ? v it follows that the object is accelerating. Isaac Newton proposed the idea of artificial satellites of the Earth. He considered how a projectile could be launched horizontally from the top of a high mountain so that it would not fall to Earth.As the launch velocity was increased, the distance that the object would travel before hitting the Earth would increase until such a time that the velocity would be sufficient to put the object into orbit around the Earth. (A higher velocity would lead to the object escaping from the Earth. ) Centripetal Acceleration As can be seen, when the change in veloc ity is placed in the average position between v1 and v2, it is directed towards the centre of the circle. When an object is moving with uniform circular motion, the acceleration (the centripetal acceleration) is directed towards the centre of the circle.For an object moving in a circle of radius r with an orbital velocity of v, the centripetal acceleration a is given by: v2 ac = r Earth Orbits A satellite can be put into Earth orbit by lifting it to a sufficient height and then giving it the required horizontal velocity so that it does not fall back to Earth. For the satellite to circle the Earth, the centripetal force required is provided by the gravitational attraction between the satellite and the Earth. Hence the centripetal acceleration is given by: v2 g= R William Kim HSC Physics Summary | page 5  §Use the term ‘g forces’ to explain the forces acting on an astronaut during launch g-forces on Astronauts Humans can withstand 4g without undue concern. Accelerations up to ~10g are tolerable for short times when the acceleration is directed parallel to a line drawn between the person’s front and back. The human body is relatively unaffected by high speeds. Changes in speed, however, that is, accelerations, can and do affect the human body creating ‘acceleration stress’. g-forces Acceleration forces – g-forces – are measured in units of gravitational acceleration g.For example, a force of 5g is equivalent to acceleration five times the acceleration due to gravity. If the accelerations are along the body’s long axis then two distinct effects are possible: 1. If the acceleration is in the direction of the person’s head they may experience a ‘black out’ as the blood rushes to their feet; or 2. If the acceleration is towards their feet, they may experience a ‘red out’ where the blood rushes to their head and retina.  § Compare the forces acting on an astronaut during launch with what happens during a roller coaster rideAs you ‘fall’ from a height, you experience negative g-forces (you feel lighter). When you ‘pull out’ of a dip after a hill or follow an ‘inside loop’, you experience positive g-forces (you feel heavier). The positive g-forces are like those astronauts experience at lift-off. Consider a rider in a car at the bottom of an inside loop. The rider has two forces acting on them: 1. Their normal weight (mg) acting down; and 2. The ‘normal reaction force’ (N) acting up. This is the push of the seat upwards on their bottom.Assume that the loop is part of a circle of radius R. A centripetal force is required for the rider to travel in a circle. This is the difference between the normal force and the weight force, that is: mv 2 mv 2 N ? mg = : N = mg + R R The g-forces are found from the ‘normal force’ divided by the weight. That is: N = mg mg + mv 2 2 R = 1+ v mg gR N mg g’s felt by rider = William Kim HSC Physics Summary | page 6  § Discuss the impact of the Earth’s orbital motion and its rotational motion on the launch of a rocketA moving platform offers a boost to the velocity of a projectile launched from it, if launched in the direction of motion of the platform. This principle is used in the launch of a rocket by considering that the Earth revolves around the Sun at 107,000km/h relative to the Sun and rotates once on its axis per day so that a point on the Equator has a rotational velocity of approximately 1,700km/h relative to the Sun. Hence, the Earth is itself a moving platform with two different motions which can be exploited in a rocket launch to gain a boost in velocity.Earth Orbit A rocket heading into orbit is launched to the east to receive a velocity boost from the Earth’s rotational motion. An Interplanetary Trip The flight of a rocket heading into space is timed so that it can head out in the direction of the Earth†™s motion and thereby receive an extra boost.  § Analyse the changing acceleration of a rocket during launch in terms of the: Law of Conservation of Momentum Forces experienced by astronauts Law of Conservation of Momentum Rocket engines generate thrust by burning fuel and expelling the resulting gases.Conservation of momentum means that as the gases move one way, the rocket moves the other. (Momentum before the burning is zero; hence the momentum after is also zero. The gases carry momentum in one direction down, and so the rocket carries an equal momentum in the opposite direction up. ) As fuel is consumed and the gases expelled, the mass of the system decreases. Since acceleration is proportional to the thrust and inversely proportional to the mass, as the mass decreases, the acceleration increases. Hence the forces on the astronauts increase.Forces Experienced by Astronauts g forces varied during the launch of Saturn V, a large three-stage rocket used to launch the Apollo sp acecraft. This is attributed to the sequential shutdown of the multiple rocket engines of each stage – a technique designed specifically to avoid extreme g forces. William Kim HSC Physics Summary | page 7  § Analyse the forces involved in uniform circular motion for a range of objects, including satellites orbiting the Earth Motion Whirling rock on a string Electron orbiting atomic nucleus Car cornering Moon revolving around Earth Satellite revolving around EarthFc Provided By†¦ The string Electron-nucleus electrical attraction Friction between tyres and road Moon-Earth gravitational attraction Satellite-Earth gravitational attraction  § Compare qualitatively and quantitatively low Earth and geostationary orbits Low Earth Orbit A low Earth orbit is generally an orbit higher than approximately 250 km, in order to avoid atmospheric drag, and lower than approximately 1000 km, which is the altitude at which the Van Allen radiation belts start to appear.The space shuttle utilises a low Earth orbit somewhere between 250 km and 400 km depending upon the mission. At 250 km, an orbiting spacecraft has a velocity of 27,900km/h and takes just 90 minutes to complete an orbit of the Earth. Geostationary Orbit A geostationary orbit is at an altitude at which the period of the orbit precisely matches that of the Earth. If over the Equator, such an orbit would allow a satellite to remain ‘parked’ over a fixed point on the surface of the Earth throughout the day and night.From the Earth such a satellite appears to be stationary in the sky, always located in the same direction regardless of the time of day. This is particularly useful for communications satellites because a receiving dish need only point to a fixed spot In the sky in order to remain in contact with the satellite. The altitude of such an orbit is approximately 38,800 km. If a satellite at this height is not positioned over the Equator but at some other latitude, it will not remain fi xed at one point in the sky.Instead, from the Earth the satellite will appear to trace out a ‘figure of eight’ path each 24 hours. It still has a period equal to the Earth’s, however, and so this orbit is referred to as geosynchronous. William Kim HSC Physics Summary | page 8  § Discuss the important of Newton’s Law of Universal Gravitation in understanding and calculating the motion of satellites Using Newton’s Law of Universal Gravitation combined with the expression for centripetal force, we can see that the orbital velocity required for a particular orbit depends nly on the mass of the Earth, the radius of the Earth and the altitude of the orbit (distance from the surface of the Earth). Given that the mass and radius of the Earth have fixed values, this means that altitude is the only variable that determines the specific velocity required. In addition, the greater the radius of the orbit, the lower the orbital velocity required. Once a launch ed rocket has achieved a sufficient altitude above the surface of the Earth, it can be accelerated into an orbit. It must attain a specific speed that is dependent only upon the mass and radius of the Earth and the altitude above it.If that speed is not reached, the spacecraft will spiral back in until it re-enters the atmosphere; if the speed is exceeded, it will spiral out. This can be considered by appreciating that the simplest orbital motion is a uniform speed along a circular path around the Earth. Uniform circular motion, as already mentioned, is a circular motion with a uniform orbital velocity. According to Newton’s First Law of Motion, a spacecraft in orbit around the Earth, or any object in circular motion, requires some force to keep it there, otherwise it would fly off at a tangent to the circle.This force is directed back towards the centre of the circle. In the case of spacecraft, it is the gravitational attraction between the Earth and the spacecraft that acts to maintain the circular motion that is the orbit. The force required to maintain circular motion, known as centripetal force, can be determined using the following equation: mv 2 FC = r The application of Newton’s Law of Universal Gravitation to the orbital motion of a satellite will produce an expression for the critical orbital velocity mentioned earlier.Recall that this law states that the gravitational attraction between a satellite and the Earth would be given by the following expression: m m FG = G E 2 S r This gravitational force of attraction also serves as the centripetal force for the circular orbital motion, hence: FG = FC Therefore, we can equate the formula for FG with that for FC: m E mS m S v 2 G = r r2 ? v = GmE r where v = orbital velocity (ms-1) where r = rE + altitude (m) William Kim HSC Physics Summary | page 9 Kepler’s Third Law: The Law of Periods Further, we can use the expression for orbital velocity to prove Kepler’s Third Law – the Law of Periods.The period or the time taken to complete one full orbit can be found by dividing the length of the orbit (the circumference of the circle) by the orbital velocity, v. 2? r T= v Changing the subject of this expression to v and then substituting into the formula for v given above: 2? r Gm E = T r 3 Gm E r ? 2 = T 4? 2 This means that for any satellite of the Earth at any altitude, the ratio r3:T2 always equals the same fixed value. William Kim HSC Physics Summary | page 10  § Describe how a slingshot effect is provided by planets for space probesMany of today’s space probes to distant planets such as Jupiter use a gravitational ‘slingshot’ effect (also known as a gravity-assist trajectory) that brings the probe close to other planets to increase the probe’s velocity. In 1974, Mariner 10 was directed past Venus on its way to Mercury. The Pioneer and Voyager probes also used this method. Consider a trip to Jupiter such as the Galileo prob e that involved a single fly-by of Venus and two of the Earth. As the probe approaches Venus, it is accelerated by Venus’ gravitational attraction, causing it to speed up relative to Venus. By Newton’s Third Law, Venus will also experience a force slowing it down. It’s mass, however, is so much greater than that of the probe that the velocity decrease is imperceptible. ) As the probe passes Venus, its speed is reduced (relative to Venus). Relative to the Sun, however, its speed has increased. The probe picks up angular momentum from the planet (which loses an equal amount of an angular momentum). Gravity allows the ‘coupling’ between the probe and planet to facilitate the transfer. For this reason, gravity-assist trajectories should more correctly be called angular momentum-assist trajectories. f = vi + 2Vi Planet vi Spacecraft Vi Vf  § Account for the orbital decay of satellites in low Earth orbit All satellites in low Earth orbit are subject to some degree of atmospheric drag that will eventually decay their orbit and limit their lifetimes. As a satellite slows, it loses altitude and begins a slow spiral downwards. As it descends, it encounters higher density air and higher drag, speeding up the process. By the time the satellite is below an altitude of 200 km it has only a few hours left before colliding with the Earth. The re-entry process generates much heat and most satellites burn up (vaporise) before impacting.William Kim HSC Physics Summary | page 11  § Discuss issues associated with safe re-entry into the Earth’s atmosphere and landing on the Earth’s surface There are significant technical difficulties involved in safe re-entry, the most important being: 1. The heat generated as the spacecraft contacts the Earth’s atmosphere; and 2. Keeping the retarding-forces (g-forces) within safe limits for humans. Heating Effects The Earth’s atmosphere provides aerodynamic drag on the spacecraft a nd as a result high temperatures are generated by friction with air molecules. Identify that there is an optimum angle for re-entry into the Earth’s atmosphere and the consequences of failing to achieve this angle. g-Forces The angle of re-entry is critical: too shallow and the spacecraft will bounce off the atmosphere back into space; too steep and the g-forces will be too great for the crew to survive (and the temperatures generated with the atmosphere will be too high even for the refracting materials used). The ‘allowed’ angle of re-entry is –6. 2 °  ± 1 ° relative to the Earth’s horizon. William Kim HSC Physics Summary | page 12 3.Future space travel and exploration will entail a combination of new technologies based on current and emerging knowledge  § Discuss the limitation of current maximum velocities being too slow for extended space travel to be viable Scientists have not yet been able to produce speeds of spacecraft more than a f ew tens of thousands of kilometres per hour. When travelling to distant planetary objects, the engines of spacecraft are not on as spacecraft rely on inertia to move along. To increase the speed significantly would require the engines to be operating, which would require more fuel.More fuel would require more thrust putting the spacecraft into orbit, which would require more fuel and so on. To increase the speed of spacecraft to values that would make interplanetary travel feasible requires a whole new technology (one not based on the emission of gases produced by combustion). Clearly, while current maximum velocities are just adequate for interplanetary travel, they are entirely inadequate for interstellar travel.  § Describe difficulties associated with effective and reliable communications between satellites and earth caused by: – distance – van Allen radiation belts – sunspot activityDistance Microwaves and radio waves, like all EM waves, travel through sp ace at the speed of light. This is the fastest speed possible in our universe and therefore places a limit on the speed and response time of space communications. The immense distance involved in space communications creates a distance-related time lag. Also, as EM radiation obeys an inverse square law, there is a loss of signal strength as distance increases. This is referred to as space loss. Van Allen radiation belts There are two belts of energetic charged particles, mainly electrons and protons, lying at right angles to the equator of the Earth.Some of the solar wind particles become trapped in the Van Allen radiation belts. Intense solar activity can disrupt the Van Allen Belts. This in turn is associated with auroras and magnetic storms. The charged particles drifting around the Earth in the outer belt corresponds to an electric current and hence has an associated magnetic field. Once or twice a month this current increases and as a result its magnetic field increases. This c an lead to interference of short wave radio communication, errors in communication satellites and even failure of electrical transmission lines.Sunspot activity Sunspots are associated with the solar wind (consisting of a stream of charged particles). The solar wind affects the Earth’s magnetic field and this in turn affects radio communication. William Kim HSC Physics Summary | page 13 4. Current and emerging understanding about time and space has been dependent upon earlier models of the transmission of light  § Outline the features of the ether model for the transmission of light It was believed that light waves require a medium to propagate. Although nobody could find such a medium, belief in its existence was so strong that it was given a name – the ether.The ether: – Filled all of space, had low density and was perfectly transparent – Permeated all matter and yet was completely permeable to material objects – Had great elasticity to support and propagate the light waves  § Describe and evaluate the Michelson-Morley attempt to measure the relative velocity of the Earth through the ether The Ether Wind Because the Earth was moving around the Sun, it was reasoned that an ether wind should be blowing past the Earth. However, if a wind blows, the speed of sound relative to the stationary observer would vary.Thus it was believed that the speed of light should vary due to the presence of the â€Å"ether wind†. It was in an attempt to detect this difference that Michelson and Morley did their famous experiment. The Michelson-Morley Experiment Light sent from S is split into two perpendicular beams by the half-silvered mirror at A. These two beams are then reflected back by the mirrors M1 and M2 and are recombined in the observer’s eye. An interference pattern results from these two beams. The beam AM1 travelled across the ether, whilst AM2 travelled with and against the ether.The times to do this can be shown to be different and so introduce a phase difference between the beams. When the entire apparatus was rotated through 90 °, a change in the interference pattern was expected. None was observed. The result of the Michelson-Morley experiment was that no motion of the Earth relative to the ether was detectable. M1 A S M2 Ether Wind  § Discuss the role of critical experiments in science, such as Michelson-Morley’s, in making determinations about competing theories From a hypothesis, predictions are made of what should happen if a particular experiment is performed.If the results are not in agreement with the prediction, the hypothesis is incorrect. As we have seen, the fact that a null result was found from this experiment showed the ether hypothesis to be invalid. This opened up a completely revolutionary view of space and time with the work of Einstein. William Kim HSC Physics Summary | page 14  § Outline the nature of inertial frames of reference Frames of Reference Frame s of reference are objects or coordinate systems with respect to which we take measurements. Position In maths, the Cartesian coordinate system is used and position is referred to the axes x, y and z.In experiments in class, the laboratory is the frame of reference. S S' r u r P v Velocity An object P travels with velocity v with respect to a reference frame S. Another frame S’ moves with velocity u relative to S. The velocity of P relative to S’ is v’ = v – u. Velocity thus depends upon the reference frame. Inertial Frames of Reference An inertial frame of reference is one that is moving with constant velocity or is at rest (the two conditions being indistinguishable). In such reference frames, Newton’s Law of Inertia holds. A non-inertial frame of reference is one that is accelerating.  § Discuss the principle of relativityThree hundred years before Einstein, Galileo posed a simple idea, now called the principle of relativity, which states that all steady motion is relative and cannot be detected without reference to an outside point. This idea can be found built into Newton’s First Law of Motion as well. Two points to be reinforced:  § The principle of relativity applies only for non-accelerated steady motion  § This principle states that within an inertial frame of reference you cannot perform any mechanical experiment or observation that would reveal to you whether you were moving with uniform velocity or standing still.William Kim HSC Physics Summary | page 15  § Identify the significance of Einstein’s assumption of the constancy of the speed of light In 1905, Albert Einstein proposed that the speed of light is constant and is independent of the speed of the source or the observer. This premise explained the ‘negative’ result of the MichelsonMorley experiment and showed that the ether concept was not needed. As a consequence of this ‘law of light’ it can be shown that ther e is no such thing as an absolute frame of reference. All inertial reference frames are equivalent. That is, all motion is relative.The laws of physics are the same in all frames of reference; that is, the principle of relativity always holds.  § Recognise that if c is constant then space and time become relative In Newtonian physics, distance and velocity can be relative terms, but time is an absolute and fundamental quantity. Einstein radically altered the assumptions of Newtonian physics so that now the speed of light is absolute, and space and time are both relative quantities that depend upon the motion of the observer. (Our reality is what we measure it to be. Reality and observation cannot be separated. Remember this as we proceed).  §Discuss the concept that length standards are defined in terms of time with reference to the original meter †¦In other words, the measured length of an object and the time taken by an event depend entirely upon the velocity of the obser ver. (This is why our current standard of length is defined in terms of time – the metre is the distance travelled by light in a vacuum in the fraction 1/299792458 of a second).  § Identify the usefulness of discussing space/time, rather than simple space †¦Further to this, since neither space nor time is absolute, the theory of relativity has replaced them with the concept of a space-time continuum. Space and time, not just space, are relative quantities).  § Account for the need, when considering space/time, to define events using four dimensions †¦Any event then has four dimensions (three space coordinates plus a time coordinate) that fully define its position within its frame of reference. William Kim HSC Physics Summary | page 16  § Explain qualitatively and quantitatively the consequence of special relativity in relation to: The relativity of simultaneity The equivalence between mass and energy Length contraction Time dilationThe Relativity of Simultanei ty (simultaneity and the velocity of light) Observers in relative motion will disagree on the simultaneity of events separated in space. The Equivalence Between Mass and Energy The mass of a ‘moving’ object is greater than when it is ‘stationary’ – it experiences mass dilation (covered later). Since c is the maximum speed in the universe it follows that a steady force applied to an object cannot continue to accelerate. It follows that the inertia, that is the resistance to acceleration, must increase.But inertia is a measure of mass and so the mass has increased. It is this increase in mass that prevents any object from exceeding the speed of light, because as it accelerates to higher velocities its mass increases, which means that further accelerations will require even greater force. This is further complicated by time dilation because, as speeds increase to near light speed, any applied force has less and less time in which to act. The combined ef fect is that as mass becomes infinite and time dilates, an infinite force would be required to achieve any acceleration at all.Sufficient force can never be supplied to accelerate beyond the speed of light. If force is applied to an object, then work is done on it – energy is given to the object. This energy would take the form of increased kinetic energy as the object speeds up. But at near light speed the object does not speed up. The applied force is giving energy to the object and the object does not acquire the kinetic energy we would expect. Instead, it acquires extra mass. Einstein made an inference here and stated that the mass (or inertia) of the object contained the extra energy.Relativity results in a new definition of energy as follows: E = E k + mc 2 where E = total energy, Ek = kinetic energy, m = mass, c = speed of light When an object is stationary, it has no kinetic energy, but still has some energy due to its mass. This is called its mass energy or rest ener gy and is given by: 8 -1 E = mc 2 where E = rest energy (J), m = mass (kg), c = speed of light (3 x 10 m s ) William Kim HSC Physics Summary | page 17 Implications of Special Relativity: To measure speed we need to measure distance and time. If c remains constant, then it follows that distance (length) and time must change.Space and time are relative concepts. Length Contraction (the Lorentz-FitzGerald Contraction) The length of a ‘moving’ rod appears to contract in the direction of motion relative to a ‘stationary’ observer. l = l0 1 ? v2 c2 where l is the moving length, l0 is the ‘rest’ length (that is, the length as measured by an observer at rest with respect to the rod) and v is the speed of the rod. Time Dilation Time in a ‘moving’ frame appears to go slower relative to a ‘stationary’ observer t= t0 1? v c2 2 where t is the observed time for a ‘stationary’ observer and t0 is the time for an observer travelling in the frame. 0 is called the proper time (this is the time measured by an observer present at the same location as the events that indicate the start and end of an event). Mass Dilation The mass of a ‘moving’ object is greater than when it is ‘stationary’. m= m0 1? v2 c2 where m is the mass for a ‘moving’ object and m0 is the mass for that object when it is ‘stationary. ’  § Discuss the implications of time dilation and length contraction for space travel The relativity of time allows for space travel into the future but not into the past.When travelling at relativistic speeds (0. 1c or faster), relativity influences the time that passes on the spacecraft. Astronauts on a relativistic interstellar journey would find their trip has taken fewer years than observed on Earth. William Kim HSC Physics Summary | page 18 Core Topic Two: Motors and Generators 1. Motors use the effect of forces on current-carrying conductors in magnetic fields  § Identify that moving charged particles in a magnetic field experience a force Charged particles moving in an external magnetic field will experience a force.If the moving charged particles are flowing through, and confined within, a conductor that is in an external magnetic field, the conductor will also experience a force. This effect is known as the motor effect. F = qvB Use left hand â€Å"FBI gun† An example: Van Allen Radiation Belts The Earth’s magnetic field captures charged particles from the solar wind (low energy) and cosmic rays (high energy). The charges are force to spiral along the field lines accumulating into two doughnut-shaped belts of â€Å"radiation† called the upper and lower Van Allen radiation belts.William Kim HSC Physics Summary | page 19  § Discuss the effect, on the magnitude of the force on a current-carrying conductor, of variations in: The strength of the magnetic field in which it is located The magnitude of the current in the conductor The length of the conductor in the external magnetic field The angle between the direction of the external magnetic field and the direction of the length of the conductor †¦The force is proportional to the magnetic field strength, B †¦The force is proportional to the current, I †¦The force is proportional to the length, L The force is at a maximum when the conductor is at right angles to the field, and is zero when the conductor is parallel to the field. The magnitude of the force is proportional to the component of the field that is at right angles to the conductor. F = BIl sin ? William Kim HSC Physics Summary | page 20  § Describe qualitatively and quantitatively the force on long parallel current-carrying conductors: Ampere’s Law Two parallel wires, each carrying a current, will exert a force on the other. This happens because each current produces a magnetic field (as in Oersted’s experiment).Therefore each wire finds itself carrying a current across the magnetic field produced by the other wire and hence experiences a force. Determining the magnitude of the force between two parallel conductors The magnetic field strength at a distance, d, from a long straight conductor carrying a current, I, can be found using the formula: kI B= d -7 -2 where k = 2. 0 x 10 N A The magnitude of the force experienced by a length, l, of a conductor due to to an external magnetic field is: F = I 2 lB or ? kI ? F = I 2l ? 1 ? ? d ? rearranged F II =k 1 2 l d F II =k 1 2 l d (Ampere’s law) I1 I2 If currents are in the same direction, then the conductors will attract. If currents are in opposite directions, then the conductors will repel. William Kim HSC Physics Summary | page 21  § Define torque as the turning moment of a force using: Torque is turning force. Its’ units are Newton-metres (Nm). ? = Fd where ? = torque, in Nm F = force, in N D = distance from rotational axis, in m F = BIl ? =BIld Rotat ional axis d ? = Fd  § Identify the forces experienced by a currentcarrying loop in a magnetic field and describe the net result of the forces b max ? = nBIA zero ? b Current Loops N I F = BIl ? =BIld ? = ? 1 + ? 2 = BIld + BIld = 2 BIld = BI (l ? 2d ) = BIA S ? = nBIA cos ? ? b (For each turn of the loop) Generally, ? =nBIA cos ? William Kim HSC Physics Summary | page 22  § Account for the motor effect due to the force acting on a current-carrying conductor in a magnetic field The motor effect Recall that charged particles moving in an external magnetic field will experience a force. If the moving charged particles are flowing through, and confined within, a conductor that is in an external magnetic field, the conductor will also experience a force.An electric motor is a device that transforms electrical potential energy into rotational kinetic energy.  § Describe the main features of a DC electric motor  § Discuss the importance of the invention of the commutator for devel oping electric motors  § Describe the role of the metal split ring and the brushes in the operation of the commutator Anatomy of a DC motor – Permanent magnets: provide an external magnetic field in which the coil rotates. As the magnets are fixed, they are known as the stator. – Rotating coil: carries a direct current that interacts with the magnetic field, producing torque. Armature: is made of ferromagnetic material and allows the coil to rotate freely on an axle. The armature and coil together are known as the rotor. The armature protrudes from the motor casing, enabling the movement of the coil to be used to do work. – Commutators: reverse the current of the coil every half turn to maintain consistent direction and torque. It is a mechanical switch that automatically changes the direction of the current flowing through the coil when the torque falls to zero. – Brushes: maintain electrical contact of coils with the rest of the circuit.The developmen t of DC motors outstripped that of AC motors and generators for two reasons: – Voltaic batteries could supply power – They could use powerful electromagnets that were far stronger than permanent magnets The development of the commutator was important because it led to the development of modern electric motors and generators. It enabled motors to provide steady circular motion of a drive shaft.  § Describe how the required magnetic fields can be produced either by currentcarrying coils or permanent magnets The magnetic field of a DC motor can be provided either by permanent magnets or by electromagnets.William Kim HSC Physics Summary | page 23 2. The relative motion between a conductor and magnetic field is used to generate an electrical voltage  § Outline Michael Faraday’s discovery of the generation of an electric current by a moving magnet Faraday had found that 3 things are necessary to generate (or â€Å"induce†) an EMF (voltage supply): – A magnetic field (from some magnets or electromagnet) – A conductor (eg. wire or coil of wire) – Relative motion / change between the field and the conductor If the conductor formed a closed loop then an induced current would also flow. ire If this wire is dropped so that it cuts flux lines, then a voltage appears between the ends because electrons are forced to the right. They eventually stop moving because they create an electric field pushing them back. As long as the magnet is moving, an emf and current is induced. Faraday’s Law ? =? n ? where ? = induced EMF, in V n = number of turns on coil ? = change in ? = magnetic flux, in Wb = BA B = magnetic flux density (field strength), in T The induced voltage can be increased by: Increasing n: more turns on the coil Increasing B: use strong magnets Increasing A: use a bigger coil Decreasing t: go faster! B A = area of coil in m 2 ? = time taken for to occur William Kim HSC Physics Summary | page 24  § Define ma gnetic field strength B as magnetic flux density Magnetic flux density is the magnetic flux per unit area and is a measure of the magnetic field strength.  § Explain the concept of magnetic flux in terms of magnetic flux density and surface area ? = BA sin ? where B = magnetic flux density, in T A = area, in m 2 ? = magnetic flux, in Wb  § Explain generated potential difference as the rate of change of magnetic flux through a circuit The induced emf is proportional to the rate of change of flux through the circuit.See Faraday’s Law (above).  § Account for Lenz’s Law in terms of conservation of energy and relate it to the production of back emf in motors Lenz’s Law This is a supplementary law to Faraday’s Law. It says that any induced emf or current will have a direction that opposes the change that caused it. This is really just a restatement of the law of conservation of energy because the induced electrical energy has come from the thing that caus es the original motion. Eg. In a hydroelectric power station, the kinetic energy of flowing water is converted into electrical energy. NWilliam Kim HSC Physics Summary | page 25  § Explain that, in electric motors, back emf opposes the supply emf Back emf Back emf is generated in any coil that experiences changing B fields, even though it is producing them. Note that back emf is frequency dependent – the higher the frequency of the changing field, the greater the back emf produced. Back emf is also produced in the rotating coil of a motor: – When the motor is spinning at its operating speed, back emf will have its max value, but†¦ – When the motor is just turned on it isn’t spinning yet so there is no back emf. This can lead to excessive current so the motor may be protected by using a â€Å"starting resistance† that limits current. When up to speed the resistor is taken out of the circuit. The coil becomes an electromagnet and generates an alternating B field BUT it also experiences the changing B field and generates its own emf that opposes the applied emf.  § Apply Lenz’s Law to the production of eddy currents Eddy Currents – are induced currents (usually unwanted or unintended) in two-dimensional conductors (eg. sheet metal) or three-dimensional conductors (eg. a block of steel).Sometimes it is necessary to design against them. Eg. the core of a motor is made of soft iron, and is made of thin layers (laminated) to prevent eddy currents. Some devices rely on eddy currents to work: Electromagnetic braking – a moving conductor near magnets will slow down because the eddy currents oppose its motion. Electromagnetic switching – security ‘gates’ that are really coils with AC generate a high frequency B field. Metal in this field develops eddy currents that work against the field, slowing it down. A detector circuit picks up on this and sets off an alarm.Induction Cooktops- are a n application of Faraday’s Law. Instead of a heating element, this cooktop contains a set of coils with alternating current passing through them. This produces a changing B field above the cooktop. A metal saucepan placed on the cooktop is a conductor in the changing B field and therefore an electric current is induced in the base of the pan. The current heats the pan, and this heat cooks the food. Induction cooktops are approximately twice as efficient as a gas cooktop, but are expensive to purchase. William Kim HSC Physics Summary | page 26 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? Movement of metal Eddy current loop 3. Generators are used to provide large scale power production in isolated areas and as a backup in emergency situations  § Identify the main components of a generator An electric generator (dynamo) is a device that includes all of the elements necessary to transform mechanical kinetic energy to electricity according to Faraday’s Law: – A magnetic field (provided by a set of permanent magnets); – A conductor (a coil mounted on an axle, so it can spin); – Relative motion (the coil is made to spin by some other form of energy). Compare the structure and function of a generator to an electric motor In fact, most generators are constructed just like a motor, however the flow of energy through them is different. Motor: electrical energy a kinetic energy Generator: kinetic energy a electrical energy  § Describe the operation of an AC and a DC generator EMF is generated in the coil and a circuit is completed to the outside world through ring connectors, just like motors. If standard slip rings are used then a dynamo naturally produces alternating current AC. I t E t Doubling the frequency of rotation doubles the maximum induced emf If a split ring commutator is used instead, then the direction of the current flowing from the coil is reversed every ? cycle. This produces a pu lsing type of direct current DC. + I t William Kim HSC Physics Summary | page 27  § Discuss the energy losses that occur as energy is fed through transmission lines from the generator to the consumer Analyse the effects of the development of AC and DC generators on society and the environmentEven good electrical conductors like copper used to supply electricity, sometimes through considerable cable lengths to towns and cities, generate substantial resistances. It follows that to minimise energy loss in the wires, the current needs to be kept low (heating losses vary as the square of the current). This is achieved by transmitting the energy at high voltages.  § Impact on society – Impact on environment – Positive Improved lifestyle Street lighting Electric trains Communication Computerisation of many systems eg. anking, stock market Industrial development a more jobs Lots of electric trains have reduced pollution from steam trains and made public transport more avai lable Electricity has replaced older, more-polluting technologies eg. electrical heating instead of coal burning in fireplaces – Negative Possible risk of cancer living near distribution cables Longer working hours Reliance on electricity leaves us vulnerable to systems loss due to electrical failure – – –Burning coal in power stations produces smoke and CO2 (a greenhouse gas) Nuclear power stations produce radioactive water & have a risk of nuclear accident Hydroelectric schemes redirect water away from river habitats Mining impacts negatively on environment Visual pollution of cables  § Assess evidence about the physiological effects on humans living near high voltage power lines 1979 study found children living near high voltage power lines appeared to develop a particular form of cancer. 997 study showed no evidence of an increase risk of childhood cancer at residential magnetic field levels. 1998 panel stated that EM fields should be considered â⠂¬Å"possible human carcinogens† and that there is â€Å"no conclusive and consistent evidence that EM fields cause any human disease. † William Kim HSC Physics Summary | page 28 4. Transformers allow generated voltage to be either increased or decreased before it is used  § Explain the purpose and principles of transformers in electrical circuits A transformer is a device that alters the voltage and current of an electricity supply.The AC voltage source produces an alternating current in the primary coil. This produces an alternating B field that threads through the secondary coil. The secondary coil now has: – Conductor – B field – Change and therefore generates its own voltage. If there is a closed loop then an alternating current will flow as well.  § Compare step-up and stepdown transformers Step-up transformers: increase voltage and decrease current Step-down transformers: decrease voltage and increase current  §Determine the relationship between the ratio of the number of turns in the primary and secondary coils and the ratio of primary to secondary voltage Vp = primary voltage (voltage in) Ip = primary current np = number of turns on primary coil Vs = secondary voltage (voltage out) Is = secondary current ns = number of turns on secondary coil Vp Vs = np ns If 100% efficient (this needs perfect â€Å"flux linkage†, usually using an iron core) then: Power in primary = Power in secondary ? V p I p = Vs I s ? ? Vp Vs Vp Vs = = Is Ip np ns = Is IpWilliam Kim HSC Physics Summary | page 29  § Explain why voltage transformations are related to the conservation of energy The Principle of Conservation of Energy states that energy cannot be created or destroyed but that it can be transformed from one form to another. This means that if a step-up transformer gives a greater voltage at the output, its current must be decreased: i. e. power in = power out.  § Explain the role of transformers in electricity sub-stati ons NSW power stations produce electricity with a voltage of about 23,000 V and a current of about 30,000 A.Unfortunately, this amount is too high to be sent through a cable. This is because it heats the cable causing energy loss. This is called joule heating and happens because: P = I2R So to reduce joule heating, the current must be reduced as much as possible with a step-up transformer. Additional transformers between the power station and consumer (in sub-stations) gradually stepdown the voltage, to 240 V by the time it gets to household users. This is because at high voltages, electricity can conduct through air, making it dangerous for use in the home. Discuss why some electrical appliances in the home that are connected to the mains domestic power supply use a transformer Most electronic circuits are designed to operate at low DC voltages of between 3 V and 12 V. Therefore, household appliances that have electronic circuits in them will have either a plug-in transformer or an inbuilt transformer to step down the domestic 240 V supply. These transformers also have a rectifier circuit built into them that converts AC to DC.TVs also contain a step-up transformer for producing the high voltages needed for the CRT.  § Analyse the impact of the development of transformers on society The development of the generator and transformer has allowed for the setting up of national power grids in almost every country, making that most convenient and flexible form of energy, electricity, accessible from many miles away. The transformer’s role is to step voltage up and down to make efficient transportation and distribution possible. William Kim HSC Physics Summary | page 30 5.Motors are used in industries and the home usually to convert electrical energy into more useful forms of energy  § Describe the main features of an AC electric motor AC induction motor: – The rotor – end rings short circuit non-ferrous rotor bars, that is sealed i. e. no e xternal connections at all (usually a â€Å"squirrel cage†). Encased in a laminated iron armature. – The stator – surrounding electromagnet. – Connection to stator – the surrounding electromagnet receives the AC. In an AC induction motor, the principle of operation is: 1. AC to surrounding electromagnet, which†¦ 2.Produces an oscillating (rotating) B field, which†¦ 3. Induces a current in the rotor, which†¦ 4. Turns the rotor into an electromagnet that†¦ 5. Tries to oppose the field being generated by the stator. 6. The stator and the rotor push against each other (using their B fields), which†¦ 7. Causes the rotor to turn! Brilliant! AC (synchronous) motor: – A rotating coil – Surrounding magnets – Connection to coil via slip rings (commutator for DC motor)  § Explain that AC motors usually produce low power and relate this to their use in power tools Power is the rate of work. Work is done when ener gy is transformed from one type to another.Induction motors are considered to produce low power because the amount of mechanical work they achieve is low compared with the electrical energy consumed. The ‘lost power’ of induction motors is consumed in magnetising the working parts of the motor and in creating induction currents in the rotor. AC induction motors are considered to be unsuitable for use in heavy industry because their low power rating would make them too expensive to run when performing a specific task. However, they are used extensively in power tools and electric domestic appliances where the loss of power is not economically significant. Explain the advantages of induction motors Advantages of AC induction motors: 1. Simplicity of design; 2. High efficiency (hence low maintenance – there are no brushes or commutators to wear out); 3. Relatively low cost William Kim HSC Physics Summary | page 31 Core Topic Three: From Ideas to Implementation 1. In creased understandings of cathode rays led to the development of television  § Explain that cathode ray tubes allowed the manipulation of a stream of charged particles Discharge Tubes – Investigation of vacuum tubes could not occur until good vacuum pumps had been invented.A vacuum tube is a glass tube fitted with an electrode at either end, and almost all of the air sucked out. – The positive electrode is the â€Å"anode†; The negative electrode is the â€Å"cathode†. When a high voltage is connected between the electrodes, an invisible ray travels from the cathode to the anode. They were called â€Å"cathode rays†. Cathode rays cause glass to glow green. – A discharge tube is a cathode ray tube with a vacuum pump fitted, so that the air pressure inside the tube can be varied. At different air pressures, different bright effects appear in the tubes e. . bands, striations and dark spaces. These are caused by cathode rays striking atoms in the air inside the tube. The atoms become excited then release photons of visible light – A beam of electrons travels from the cathode to the anode and can be deflected by electrical and/or magnetic fields. Anode Glass glows here Cathode  § Explain why the apparent inconsistent behaviour of cathode rays caused debate as to whether they were charged particles or electromagnetic waves In 1892 Hertz demonstrated that cathode rays could penetrate thin metal foils.This he believed supported a wave nature. In 1895 Jean-Baptise Perrin showed that cathode rays deposited negative charges on impact with an object, suggesting a particle nature. There was controversy over the nature of cathode rays – waves or particles. William Kim HSC Physics Summary | page 32  § Identify that charged plates produce an electric field If metal plates are separated by a distance and are attached to a power source, an electric field will be produced between them. E = V/d  § Describe quantitati vely the force acting on a charge moving through a magnetic fieldRecall that the force (F) acting on a charge (q) moving with a velocity (v) at an angle to a magnetic field (B), is given by: FB = qvB Where FB = magnetic force (N) q = charge (C) v = velocity of charge (ms-1) B = magnetic field strength (T)  § Discuss qualitatively the electric field strength due to a point charge, positive and negative charges and oppositely charged parallel plates. Describe quantitatively the electric field due to oppositely charged parallel plates ++++++++ If a positive charge is placed near another positive charge, it will experience a force of repulsion.A positive charge placed in a field will experience a force in the direction of the arrow. A negative charge placed in a field will experience a force opposite to the direction of the arrow.  § FE = qE Where FE = electric force (N) q = charge (C) E = electric field strength (NC-1) ———– William Kim HSC Physics Summar y | page 33  § Outline Thomson’s experiment to measure the charge/mass ratio of an electron Cathode ray particles ? v? B ? ? ? ? ? ? ? FM ? ? FE ? ? ? v? E ? ? ? J. J. Thomson’s Experiment – By fitting plates to his CRT, he could subject the cathode rays to an electric field.The rays deflected, proving that they were charged particles, not electromagnetic waves. – He noticed that the rays deflected toward the positive plate, proving that they were negatively charged particles. – By crossing electric and magnetic fields, Thomson was able to deduce the velocity of the cathode rays. By turning off the E field, the particles followed a circular arc caused by the B field. The magnetic force was acting like a centripetal force. mv qvB = r q v ? = m Br – 2 ? FM = FE qvB = qE E ? v = B Thomson adjusted the strength of the fields so that the particles were not deflected.By carefully measuring the strength of the fields, Thomson could calculate v. T homson had already measured B and worked out v. By measuring the radius of curvature r, he could then calculate q/m, i. e. the charge/mass ratio of an electron. q/m for these particles was 1800 times greater than for a hydrogen ion, the simplest known atomic ion. Thomson quickly compared the charges and found them to be about the same (though opposite in sign) Therefore mass for cathode ray particles was 1800 times smaller than hydrogen Therefore cathode ray particles were subatomic particles!This was the first discovery of subatomic particles They were later called electrons. William Kim HSC Physics Summary | page 34  § Outline the role in a cathode ray tube of: Electrodes in the electrode gun The electric field The fluorescent screen The Cathode Ray Tube Each CRT has a vacuum tube/chamber, a cathode, an anode, and a target. Electrodes in the electron gun The electron gun produces a narrow beam of electrons. It consists of a filament, a cathode and two open-cylinder anodes. The a nodes help to accelerate and focus the electrons.A ring shaped electrode – the grid – between the cathode and anodes controls the brightness of the spot by controlling the number of electrons emitted by the gun. By making the grid negative with respect to the cathode the number of electrons, and hence the brightness is reduced. The electric field Acts as a deflection system. It consists of two sets of parallel plates connected to a parallel plates connected to a potential difference. This produces an electric field between the plates. The Y-plates control the vertical deflection and the X-plates the horizontal deflection.The fluorescent screen The inside glass of the end of the tube is coated with a fluorescent material for example, zinc sulphide. When an electron beam hits the screen, the coating fluoresces and a spot of light is seen on the screen. The screen acts as a detector of cathode rays. Electrons Cathode Anode To plates and screen William Kim HSC Physics Summ ary | page 35  § Outline applications of cathode rays in oscilloscopes, electron microscopes and television sets The Cathode Ray Oscilloscope (CRO) Is an electronics diagnostics device because it can show a graph of how voltages vary over time.Deflection of the electron beam is achieved by two sets of plates. Horizontal plates cause vertical deflection while vertical plates cause horizontal deflection. TV Tube An electron gun again produces the electron beam. Coils are used instead of plates, however. Electric current through the coils produce magnetic fields that can deflect the beams quickly from side to side, and more slowly from bottom to top. In this way the beam scans the entire screen. By varying the intensity of the beam, a picture is built up. The picture is refreshed 50 times / second, which is too fast to be noticed by the human eye.The Electron Microscope Uses electrons instead of light. Their wavelength is 100,000 times smaller than visible light, therefore their reso lving power is 100,000 times greater. – A â€Å"sample† is placed inside the chamber (which is really the CRT) – The air is then sucked out – An electron gun produces the electron beam – Coils produce magnetic fields to focus the beam (â€Å"magnetic lenses†) – The beam scans over the surface of the sample – Detectors pick up the reflected and scattered electron beam, and from this information a 3 dimensional image is constructed  §Discuss the impact of increased understandings of cathode rays and the development of the oscilloscope on experimental physics The introduction of electronic control systems into all forms of science and industry has seen the cathode ray oscilloscope (CRO) become one of the most widely utilised test instruments. Because of its ability to make ‘voltages’ visible, the cathode ray oscilloscope is a powerful diagnostic and development tool. William Kim HSC Physics Summary | page 36 2.The r econceptualisation of the model of light led to an understanding of the photoelectric effect and black body radiation  § Explain qualitatively Hertz’s experiments in measuring the speed of radio waves and how they relate to light waves Recall: Maxwell’s theory of electromagnetic waves In 1864 Maxwell, through a set of four brilliant equations, predicted a range of invisible waves made up of an electric and magnetic wave that regenerate each other. The speed of these waves was calculated to be 3 x 108 ms-1 and probably included light.E v B Heinrich Hertz’s Experiment: (proving Maxwell’s theory) Performed in 1886, Hertz built equipment to generate and transmit EM waves with ? ? 1m. He also had a separate receiver (a loop of wire) located about 20m away. Spark gaps were included to show when high voltage AC was present in the transmitter or receiver. The receiver spark only appeared when the transmitter spark was present. Hertz hypothesised that the sparks set up changing electric and magnetic fields that propagated as an electromagnetic ave, as postulated by Maxwell. He showed that these were waves being transmitted because he could reflect, refract and polarise them. By measuring the frequency, he calculated v (v = f ? ) and it came out as 3 x 108 ms-1. These properties proved Maxwell’s theory and as they are also exhibited by light, Hertz was able to provide experimental evidence that light is a form of transverse electromagnetic wave. to induction coil < 1mm gap transmitter charged plates receiver William Kim HSC Physics Summary | page 37  §Describe Hertz’s observation of the effect of a radio wave on a receiver and the photoelectric effect he produced but failed to investigate Outline applications of the production of electromagnetic waves by oscillating electric charges in radio antennae Hertz observed that the transmitter spark was producing s