Nation Building essays

Nation Building essays Between 1400 and 1800 most of the states of Western Europe were heavily influenced by an economic policy known as mercantilism. No general definition of mercantilism is entirely satisfactory, but for the purposes of this paper it is thought of as a collection of policies designed to keep the state prosperous by economic regulation. Secondly, it was a series of economic controls intended to strengthen the military and colonies of a country, against other antagonistic empires. These two principles of mercantilism are interconnected, and they give an accurate view of the common attitude that shaped this time period. This concept has been coined as nation building. Before this time period commerce was literally viewed as a sin. There was no moral/ethical allowance for merchants to make any profit from trade. This was reflected by the Churchs control over economic dealings. But the decline of the medieval feudal economy gave rise to nation-states, bringing forth a revolution in commercial activity. This revolution sparked new thinking in wealth accumulation. Instead of viewing money as a mortal sin, it was now seen as the main source of a nations wealth. No longer was the market viewed as an entity in its own right, independent of the state, but viewed as a political institution designed to serve the national interest. (Duchesne pp. 7) With the rise of the nation-state, there was awareness that the central government could become more powerful if they could accumulate more wealth through trade. The driving force behind virtually all trade was the merchant. Merchants slowly adopted a doctrine called the balance of trade theory, which says that the source of wealth comes from selling more than one bought, especially in regards to other nations. Therefore, international trade was passionately pursued, to enhance the accumulation of wealth. As the economist Thomas Mun suggested, th...

A Genetics Definition of Homologous Chromosomes

A Genetics Definition of Homologous Chromosomes Homologous chromosomes are chromosome pairs (one from each parent) that are similar in length, gene position, and centromere location. The position of the genes on each homologous chromosome is the same. However, the genes may contain different alleles. Chromosomes are important molecules, as they contain DNA and the genetic instructions for the direction of all cell activity. They also carry genes that determine individual traits. Homologous Chromosomes Example A human karyotype shows the complete set of human chromosomes. Human cells contain 23 pairs of chromosomes, for a total of 46. Each chromosome pair represents a set of homologous chromosomes. One chromosome in each pair is donated from the mother and the other from the father during sexual reproduction. In a karyotype, there are 22 pairs of autosomes (non-sex chromosomes) and one pair of sex chromosomes. In males, the X and Y sex chromosomes are homologs. In females, both X chromosomes are homologs. Mitosis The purpose of mitosis (nuclear division) and cell division is to replicate cells for repair and growth. Before mitosis begins, chromosomes must be replicated to ensure that each cell retains the correct number of chromosomes after cell division. Homologous chromosomes replicate forming sister chromatids (identical copies of a replicated chromosome that are attached). After replication, the single-stranded DNA becomes double-stranded and has the familiar X shape. As the cell progresses through the stages of mitosis, sister chromatids are eventually separated by spindle fibers and divided between two daughter cells. Each separated chromatid is considered a full single-stranded chromosome. Interphase: Homologous chromosomes replicate forming sister chromatidsProphase: Sister chromatids move toward the center of the cellMetaphase: Sister chromatids align along the metaphase plate at the cells centerAnaphase: Sister chromatids are separated and pulled toward opposite cell polesTelophase: Chromosomes are separated into distinct nuclei After the cytoplasm is divided during cytokinesis, two new daughter cells are formed with the same number of chromosomes in each cell. Mitosis preserves the homologous chromosome number. Meiosis Meiosis is the mechanism for gamete formation and involves a two-stage division process. Prior to meiosis, homologous chromosomes replicate forming sister chromatids. In prophase I, sister chromatids pair up forming what is called a tetrad. While in close proximity, homologous chromosomes sometimes exchange sections of DNA. This is known as genetic recombination. Homologous chromosomes separate during the first meiotic division and sister chromatids separate during the second division. At the end of meiosis, four daughter cells are produced. Each cell is haploid and contains half the number of chromosomes as the original cell. Each chromosome has the appropriate number of genes, however, the alleles for the genes are different. The swapping of genes during homologous chromosome recombination produces genetic variation in organisms that reproduce sexually. Upon fertilization, haploid gametes become a diploid organism. Nondisjunction and Mutations Occasionally, problems arise in cell division that cause cells to divide improperly. Failure of chromosomes to separate correctly in mitosis or meiosis is called nondisjunction. Should nondisjunction occur in the first meiotic division, homologous chromosomes remain paired. This results in two daughter cells with an extra set of chromosomes and two daughter cells with no chromosomes. Nondisjunction may also occur in meiosis II when sister chromatids fail to separate prior to cell division. Fertilization of these gametes produces individuals with either too many or not enough chromosomes. Nondisjunction is often fatal or may produce chromosomal anomalies resulting in birth defects. In trisomy nondisjunction, cells contain an extra chromosome. In humans, this means that there are 47 total chromosomes instead of 46. Trisomy is seen in Down syndrome where chromosome 21 has an additional or partial chromosome. Nondisjunction may also produce abnormalities in sex chromosomes. Monosomy is a type of nondisjunction in which only one chromosome is present. Females with Turner syndrome have only one X sex chromosome. Males with XYY syndrome have an extra Y sex chromosome. Nondisjunction in sex chromosomes typically has less severe consequences than nondisjunction in autosomal chromosomes (non-sex chromosomes). Chromosome mutations can impact both homologous chromosomes and non-homologous chromosomes. A translocation mutation is a type of mutation in which a piece of one chromosome breaks off and is joined to another chromosome. This type of mutation occurs more often between non-homologous chromosomes and can be reciprocal (gene exchange between two chromosomes) or non-reciprocal (only one chromosome receives a new gene segment).

Social Work Mental Health Literature review Example | Topics and Well Written Essays - 3000 words

Social Work Mental Health - Literature review Example Social workers themselves can, in turn, influence people to raise their own levels of self confidence through the positive work that they do, as well as the quality services that they provide (Gray & Schubert 2010). The degree of expertise that a social worker has, and the skill sets that they come into the position with, largely depends on the quality of the training that they have received. With this in mind, it can be said that social workers need to be trained to take it upon themselves to improve their own effectiveness in work with individuals that have a mental illness, all in an effort to perform the various job functions assigned to them with excellence. To accomplish this objective will require possessing the ability to manage a complex discipline, in addition to the challenging situations that arise on a daily basis, in order to provide maximum benefit to both the individual and to society as a whole. The focus of the following literature review is to provide the reader wi th a cursory overview of the function that social workers play within the treatment of mentally ill individuals, as well as a critical analysis of two health models that more effectively cover this topic in depth (Bogg 2014). Recent trends indicate that social workers can literally transform the lives of people that have a mental health condition. This demonstrates their significance in modern society (Allen 2014). This is accomplished through their ability to improve the quality of services provided to people that have a mental illness and through the dedication exhibited by social workers, as they are the very professionals trained and this field and possess the capability to truly make a difference in this discipline. It should be mentioned, as well, that the field of mental health is a ripe area for the practice of social work, and within this context such individuals are well positioned to impact society in a positive manner. Social workers do provide

Vector GIS Project Essay Example | Topics and Well Written Essays - 2000 words

Vector GIS Project - Essay Example Purchasers may be individuals or businesses. In commerce, a retailer buys goods or products in large quantities from manufacturers or importers, either directly or through a wholesaler, and then sells smaller quantities to the end-user. Retail establishments are often called shops or stores. Retailers are at the end of the supply chain. Manufacturing marketers see the process of retailing as a necessary part of their overall distribution strategy. Shops may be on residential streets, or in shopping streets with few or no houses, or in a shopping center or mall, but mostly found in the central business district. Shopping streets may or may not be for pedestrians only. Sometimes a shopping street has a partial or full roof to protect customers from precipitation. Retailers often provided boardwalks in front of their stores to protect customers from the mud. Online retailing, also known as e-commerce is the latest form of non-shop retailing (cf. mail order). Shopping generally refers to the act of buying products. Sometimes this is done to obtain necessities such as food and clothing; sometimes it is done as a recreational activity. Recreational shopping often involves window shopping (just looking, not buying) and browsing and does not always result in a purchase. The superstore was designed to serve the community exclusively and accompany a website and catalog. Customers are sure to find thigh quality, brand-named dancewear discounted up to 30 percent. The superstore will offer wonderful customer service, Other features include computer kiosks where shoppers can browse the website, place orders, or post reviews and ratings for their favorite products. Working geographically reveals relationships among the forces that drive your organization. It helps you see patterns you could not see before, gain new insights, and make

The Cold War of the Middle East Essay Example for Free

The Cold War of the Middle East Essay Nuclear weapons: these are tools capable of massive destruction and death. If the wrong people obtain such weaponry, it could lead to catastrophic consequences worldwide. As of right now, Iran is developing weapons grade uranium. The Prime Minister of Israel, Benjamin Netanyahu, gave a speech to the United Nations in which he presented the progress of Iran’s uranium enrichment program to the General Assembly. Netanyahu was quoted in the Weekly Standard saying, â€Å"Wheres Iran? Irans completed the first stage. It took them many years, but they completed it and theyre 70% of the way there; it is only a few months, possibly a few weeks before they get enough enriched uranium for the first bomb. † Iran’s development of nuclear weaponry is a threat to Israel and therefore the United States. Israel must take all precautionary measures to prevent Iran from finishing its nuclear program and this includes military action. If something were not done to prevent Iran from developing nuclear weapons, then the US would be pulled into a gruesome war with nuclear weapons. Currently, Israel is the only country in the Middle East to have nuclear weapons. However, this could all change by 2013. Iran has been enriching uranium and is seventy percent of the way to making a nuclear missile capable of destroying Israel. Iran’s current leader, President Mahmoud Ahmadinejad, has been previously been quoted in the Jerusalem Post saying that Israel has no place in the â€Å"Holy Land† and that Israel is a â€Å"fake regime† that â€Å"must be wiped off the map†. If Iran obtains enough enriched uranium, Ahmadinejad’s statement may become a gruesome reality. Now one may wonder where the USA plays a part in this standoff in the Middle East. When Israel was created by Britain in 1948, its first ally was the US, and since then, their relationship has tremendously strengthened. Now, Israel is more than an ally to the US; it is a true friend. If Israel were to take military action, it would most definitely get backing from the USA. Now one might argue that the that attacking Iran enables too many risks. Casualties would be high, Iran is a very formidable opponent and also, sanctions against Iran are in place, and all the US and have to do is be Patient However, Israel has already fought multiple wars against numerous countries in the Middle East, and it has one of the strongest militaries in the world. The country with the strongest military in the world happens to be Israel’s long time ally; the US. Thus the US and Israel combined would be more than capable to fight against Iran. If something is not done beforehand to stop Iran’s nuclear program, the consequences will be cataclysmic. Also, even though the sanctions have crippled Iran’s economy, according to the BBC, these have not even delayed Iran’s nuclear program. The global community has drawn a clear red line for Iran, and Iran is inches from crossing that red line. Action must be taken to stop Iran in its tracks. The consequences of not acting far outweigh the risk of war.

Change Management Plan :: Business Management Analysis

Change Management Plan Change is essential to today's business environment. If a company is to survive and succeed on a macro level, they should analyze and adopt the best overall plan for change on an enterprise level. When examining the best way to make changes in a company that will globally affect the company, it is usually best to look at the total picture before acting, lest the plan fail. This paper will briefly summarize four key areas that leaders and managers must understand in order to successfully make a change, or in the case of our model company CrysTel, manage change dynamically throughout the life of the company. In order to understand completely the change it wants to make, the company must understand the implications of the change and the human variables of change implementation. The company should also strive to understand how to monitor the progress of the change, and how to ensure the continued success of the change. The following paragraphs are an explanation of what CrysTel is, why i t needs to change, and how these four key areas can be manipulated to help it succeed in its dynamic need for change in the ever-changing environment it lives in. Implications of Organizational Change CrysTel is a telecommunications company that exists in a very dynamic environment, and it has the need for all aspects of itself to be dynamic and able to change relatively quickly. The upper management recently realized that CrysTel has the need to bring more products and services into its portfolio. That means that everybody who works for the company needs to be good at analyzing the best way to change, implementing a change, and sustaining the change. It also means that CrysTel employees need to change with the organization. In order for all of the employees to be good at the constant change that will be happening and be as dynamic as they need to be, they have to have good and dynamic leaders and managers to aid in the effort. Without the support from above, the employees will probably lose focus and the desire to see the company succeed (Miller et al, 2004). If the company does not prepare well, it might experience a high turnover rate as well. A study conducted by Lester Coch a nd John R.P. French showed that if a group of workers was not prepared for a change properly, that group exhibited a high turnover rate (Krietner & Kinicki, 2003).

Only ten sort story annotation Essay

The author of the short story Only Ten hooks the reader in on the first couple sentences because of the mystery of The Shah and the way he describes him. He starts off the story with showing how difficult it can be for refugees to adapt and fit in in another country. As it shows in the orientation it is not uncommon for these people to have a hard time fitting in and opening up in the new place. This can happen to any person not just a refugee but it can be especially hard for them because of them being different. The author shows this by describing The Shah in a certain way that we use what we know of immigrants and apply it to him. Because of refugees being different they could be picked on and even attacked. The author uses similes such as â€Å"Bruce leaped at The Shah with a wild yell, swinging his ruler above his head as if it was a sword† to show violence. Later on it shows that not all countries are as fortunate as us in the way that The Shah was overjoyed that something was actually growing which is an example of the author using vocabulary. The author uses a technique called a metaphor to keep the readers interested. An example of this is when The Shah was playing footy he suddenly curled up like a ball to protect himself thinking that the ball was something other than a ball. Most probably being a bomb. Showing that he has been around bombs before when they go off or seen the devastation of the aftermath of the bomb. The author of the short story Only Ten is very creative in ways of saying what he wants to say. He leaves vague hints and little bit of evidence that throughout the story the reader has to piece together. Then the author offers a big bit of info at the end to provide a means to fully understand to hints and evidence scattered throughout the text. The title is a good choice as it refers to The Shah’s life as he had to become a child soldier and fight, get hurt and even kill people. The title refers to the fact that he is only ten. The setting is well chosen as it does actually happen a lot in real life and it is set up so throughout the story it is easy to give bits of evidence away. The main complication in the story is that The Shah is hesitant to reveal any information the author uses many techniques to show this one way is a series of short sentences to build suspense, foreshadowing and a few other techniques. In my life I have met many people that come from other countries to live in Australia although none of them are refugees they still face some of the same problems that refugees face such as bullying and not being able to fit in well. Most of these problems were overcome by the victims just being so friendly that people found it hard to pick on them and still keep their reputation. The story is well written and very creative it hooks the reader in the first few sentences through the use of mystery. The story then goes on to build on that mystery and add suspense and tension throughout the story. The author writes in a way that a reader can connect to the text on some level and even understand what the fictional characters are going through. Throughout the story he drops bits of evidence to keep the reader interested then right at the end drops the information that the readers have been trying to figure out leading to a very satisfying read.

Media Representation in Lgbt

Media and its representation of Lesbian, Gay, Bisexual, Transsexual (LGBT) themes has been prevalent throughout time. According to the collections of studies and stories by Meem, Mitchell and Jonathan (2010) concerning LGBT individuals, it is important to represent such themes because it is able to enlighten people on how our society as a whole, has become dynamic. The Media can be seen as a â€Å"central source† where negative perceptions can be created. As a result, stereotypes can be either created or perpetuated about this group, negative or otherwise. Media as a medium, therefore, is an extremely powerful tool in our society, and can be used to change or create people's perceptions about this particular segment of our world (LGBT). Stereotyping people can be harmful and have long lasting effects on us as a society, â€Å"It can transform slight assumptions on people and make them perceived realities† (Meem, Mitchell; Jonathan 2010). Such stereotypes are capable of perpetuating inequality and social prejudice in society. However, it is imperative to note that stereotyping through the media is sometimes inevitable. In the case of television, stereotyping occurs through advertisements, news bulletins and entertainment. For films, stereotyping has been used as a form of marketing. The stereotypical codes give television and film audiences a common and quick way of understanding a particular person. In most cases, stereotypical codes focus on ethnicity, social roles, sexual orientation, occupation, race and gender. Most often, the groups being stereotyped may not defend themselves. They are usually the minority and raising their voices may make little or no impact. However, there are some measures, which have been instituted to help reduce stereotyping. For instance, media campaign against this vice has become useful in reducing stereotypes in society. However, the vice is still rampant in some sections of the media. â€Å"There are those who have a common tendency of thinking that the way people think and can be uniform across the globe† (Carroll, 2009). This is not true people are diverse and their mindsets also vary. This is mostly applicable in homosexuality whereby gays and lesbians are viewed to be outside the mainstream or dominant culture. With the emergence of gothic culture, it is probable to categorize them as being weird or abnormal. The dominant culture in this case refers to marriage and love relationships between people of different gender. Same sex marriages and behavioral patterns are prevalent in virtually all cultures. As Carroll (2009) documents, â€Å"same sex behavior is found in every culture, and its prevalence remains about the same† (p. 290). The media is a viable source of information in society such that televisions and films are very influential due to both sound and visual effect. These two mediums of communication are crucial in symbolic annihilations of lesbians and gays. According to Vollmer (2003), films and TVs tend to avoid integrating gays and lesbians in their programs for fear of offending advertisers, target audiences as well as investors. This kind of portrayal is not desirable because it denies them their human rights. The fact that they belong to a new generation culture does not mean that they should not enjoy their rights. With their visual effects, the two mediums of communication cultivate a perception that homosexuals are bad elements in society. They should not be given a chance to be heard if they have views to express. Due to fear of loosing audience and revenues, these two mediums of communication edit their programs to extent that audiences place homosexuals under the category of abhorred people. This has extended even in the ways they are covered in television news. â€Å"The issue of sexual orientation has been used as an indicator of villainy and deviance in children’s movies† (Vollmer, 2003). If children were to be shown movies that portray homosexuals as bad characters in society, then, they would grow up hating them. A negative perception is cultivated in such children. Such kinds of stereotypes can instigate violence in society. For example, a gay male may not be welcomed in a party due to his sexual orientation. It is only a question of ethics. Homosexuals are also put as either victims or villains in movies. They are depicted as belonging to a weird or foreign culture that cannot be tolerated. It is rare to have a movie that has the main character being gay or lesbian. If a girl begins to demonstrate some signs of male characteristics, she is referred to as a ‘tom-boy’. It is like a taboo to show such kinds of signs in a girl. On the other hand, if a male does not have masculine features, he is seen as an outcast. All of these perceptions are obtained from the media, and especially televisions and movies. According to Mehta and Hay (2005), media houses have for a long time helped to construct and reinforce stereotypical ideas about masculinity and men. From what is portrayed in the media, it is possible for people to dismiss others on the basis of whether they have masculinity or are feminine (Ferrey, 2008). Televisions and movies through their visual effects help define ‘a real man’. During advertisements, there are some particular aspects of man that are portrayed. A man who fails to have certain forms of male features may not be shown on TV or may not be considered for a film (Cohen ; Hall, 2009). Moreover, the marketing companies have started to objectifying men in the same manner women have been objectified. The fitness of a man, his muscles and general outlook count a lot in determining whether he is to feature in a program or not. Men are so used to this behavior, they do not see the need to object. Therefore, the media will never stop giving what one considers ‘good or real’ men airplay. Forming a type of segregation. A research study titled, Attitudes toward stereotypical versus counter-stereotypical gay men and lesbians indicates that six hundred and sixty two confessed gays, lesbians and bisexuals had contended with victimization in the society (Cohen ; Hall, 2009). Of those, 20% reported to have been attacked or abused because of their sexual orientation. In the year 2005, Federal Bureau had reported 1,171 of hate crime offenses took place because of homosexual orientation. This is the kind of segregation that has existed in the society for centuries. The major problem is because media and mostly electronic media show homosexuals as people who have undertaken ‘abnormal’ directions of life. They are not part of the mainstream culture. The only solution is for governments to create institutions that can help people understand that everybody should enjoy unlimited human rights. Forums can also help eradicated the notions cultivated by the media, about gays and lesbians and institute a culture of tolerance. In summary, no particular person should be segregated or discriminated on the basis of their sexuality. However, gender pre-judgments are still present in all media, the best remedy to help integrate all people no matter their sexuality, is to spend resources on education. Young people need to be taught tolerance and understanding in order to accept all kinds of people, regardless of their sexual orientation and direction. References Carroll, J. L. (2009). Sexuality now: embracing diversity. Belmont: CengageBrain Learning. Cohen, T. R. ; Hall, D. L. (2009). Attitudes toward stereotypical versus counter-stereotypical gay men and lesbians. Retrieved on 17th November 2011 from http://findarticles. om/p/articles/mi_m2372/is_4_46/ai_n35656044/ Ferrey, P. A. (2008). Gender Stereotypes persist. Retrieved on 17th November 2011 from http://www. nytimes. com/inc_com/inc1211198677212. html Meem, D. T. , Michelle A. G. , ; Jonathan A. (2010). Finding Out: An Introduction to LGBT Studies. Thousand Oaks, CA: Sage. Mehta, V. P. ; Hay, K. (2005). A superhero for gays? Gay masculinity and green lantern . The Journal of American Culture, 28(4), 390-404. Vollmer, M. L. (2003). Gender transgression and villainy in animated film. Taylor ; Francis Journal, 1(2), 89-109.

Drama Coursework Help

Drama Coursework Help Drama Coursework Help Drama Coursework Help: Make Your Work Creative If you are an often visitor of Literature class, dramatic essay or dramatic coursework are the assignments that are going to become your close friends during the process of study, as with the help of dramatic essay it is very simple to check the level of knowledge of a student he or she has received during attending classes. As drama is considered to be an art, sometimes it is rather difficult to understand the message an author is trying to transfer to the readers, especially, if the student does not have any experience in drama coursework writing. That is why the majority of people often find themselves in need of drama coursework help. Professional Coursework Help Is Right Here! If you are looking for drama coursework help, you can find your own drama coursework help within servicing of our custom writing, and at this point, you may be sure that drama coursework help you are going to get will be of the highest level of professionalism and the dramatic essay you are going to receive will be worth of the highest grade. However, apart from visiting our custom writing service you can also receive drama coursework help with the help of this very article. Here you are going to get a professional drama coursework help on the subject of how to make your drama coursework or dramatic essay be creative and interesting. Make use of unusual piece of writing in your dramatic essay, if the play you are dealing with is mysterious one you will fail to write dull dramatic essay. When you read interesting and creative piece of drama, it inspires you to write about it in the same interesting and creative way. Play with the characters while writing your essay; pretend to have an interview with them and write what they could answer, place them in some extraordinary environment, make them to exchange their roles. Such techniques always help in dramatic essay writing. Pay special attention to this very advice offered by our drama coursework help and you are certain to write a creative piece. If your professor does not insist that your dramatic essay should be written according to all the requirements from it and understands that your dramatic essay is a piece of art itself, which can not be measured by any frames, give a special design to your essay by placing the images of characters on the pages of your dramatic essay: If You Need Help with Coursework Contact Us Without Hesitation! We hope that you will find our drama coursework help to be useful. Good luck with your writing. Read also: Sport Research Paper Research Proposal Guidelines Research Paper Topics Research Paper Ideas How to Write a Research Paper

Photoelectric Effect Definition and Explanation

Photoelectric Effect Definition and Explanation The photoelectric effect occurs when matter emits electrons upon exposure to electromagnetic radiation, such as photons of light. Heres a closer look at what the photoelectric effect is and how it works. Overview of the Photoelectric Effect The photoelectric effect is studied in part because it can be an introduction to wave-particle duality and quantum mechanics. When a surface is exposed to sufficiently energetic electromagnetic energy, light will be absorbed and electrons will be emitted. The threshold frequency is different for different materials. It is visible light for alkali metals, near-ultraviolet light for other metals, and extreme-ultraviolet radiation for nonmetals. The photoelectric effect occurs with photons having energies from a few electronvolts to over 1 MeV. At the high photon energies comparable to the electron rest energy of 511 keV, Compton scattering may occur pair production may take place at energies over 1.022 MeV. Einstein proposed that light consisted of quanta, which we call photons. He suggested that the energy in each quantum of light was equal to the frequency multiplied by a constant (Plancks constant) and that a photon with a frequency over a certain threshold would have sufficient energy to eject a single electron, producing the photoelectric effect. It turns out that light does not need to be quantized in order to explain the photoelectric effect, but some textbooks persist in saying that the photoelectric effect demonstrates the particle nature of light. Einsteins Equations for the Photoelectric Effect Einsteins interpretation of the photoelectric effect results in equations which are valid for visible and ultraviolet light: energy of photon energy needed to remove an electron kinetic energy of the emitted electron hÃŽ ½ W E whereh is Plancks constantÃŽ ½ is the frequency of the incident photonW is the work function, which is the minimum energy required to remove an electron from the surface of a given metal: hÃŽ ½0E is the maximum kinetic energy of ejected electrons: 1/2 mv2ÃŽ ½0 is the threshold frequency for the photoelectric effectm is the rest mass of the ejected electronv is the speed of the ejected electron No electron will be emitted if the incident photons energy is less than the work function. Applying Einsteins special theory of relativity, the relationship between energy (E) and momentum (p) of a particle is E [(pc)2 (mc2)2](1/2) where m is the rest mass of the particle and c is the velocity of light in a vacuum. Key Features of the Photoelectric Effect The rate at which photoelectrons are ejected is directly proportional to the intensity of the incident light, for a given frequency of incident radiation and metal.The time between the incidence and emission of a photoelectron is very small, less than 10–9 second.For a given metal, there is a minimum frequency of incident radiation below which the photoelectric effect will not occur so no photoelectrons can be emitted (threshold frequency).Above the threshold frequency, the maximum kinetic energy of the emitted photoelectron depends on the frequency of the incident radiation but is independent of its intensity.If the incident light is linearly polarized then the directional distribution of emitted electrons will peak in the direction of polarization (the direction of the electric field). Comparing the Photoelectric Effect With Other Interactions When light and matter interact, several processes are possible, depending on the energy of incident radiation. The photoelectric effect results from low energy light. Mid-energy can produce Thomson scattering and Compton scattering. High energy light can cause pair production.

U10a2 Life Cycle of the Stars Paper Essay Example | Topics and Well Written Essays - 1250 words

U10a2 Life Cycle of the Stars Paper - Essay Example Astronomers can determine the mass, age, chemical composition and many other properties of a star by observing its spectrum, luminosity and motion through space. The total mass of a star is the principal determinant in its evolution and eventual fate. Other characteristics of a star are determined by its evolutionary history, including diameter, rotation, movement and temperature. A plot of the temperature of many stars against their luminosities, known as a Hertzprung-Russell diagrams (H–R diagram), allows the age and evolutionary state of a star to be determined. Stellar evolution is the process by which a star undergoes a sequence of radical changes during its lifetime. Depending on the mass of the star, this lifetime ranges from only a few million years (for the most massive) to trillions of years (for the least massive, which is considerably more than the age of the universe). Stellar evolution is not studied by observing the life of a single star, as most stellar changes occur too slowly to be detected, even over many centuries. Instead, astrophysicists come to understand how stars evolve by observing numerous stars at the various points in their life, and by simulating stellar structure with computer models. Stellar Evolution: A nebula is a cloud of gas (hydrogen) and dust in space. Nebulae are the birthplaces of stars. There are different types of nebula. An Emission Nebula which glows brightly because the gas in it is energized by the stars that have already formed within it. In a Reflection Nebula, starlight reflects on the grains of dust in a nebula. The nebula surrounding the Pleiades Cluster is typical of a reflection nebula. Dark Nebula also exists. These are dense clouds of molecular hydrogen which partially or completely absorb the light from stars behind them. 1st stage of a stars life: PROTOSTAR Stellar evolution begins with the gravitational collapse of a giant molecular cloud (GMC). As it collapses, a GMC breaks into smaller and small er pieces. In each of these fragments, the collapsing gas releases gravitational potential energy as heat. As its temperature and pressure increase, a fragment condenses into a rotating sphere of superhot gas known as a prostar. Protostars with masses less than roughly 0.08Â  M (1.6?1029 kg) never reach temperatures high enough for nuclear fusion of hydrogen to begin. These are known as brown dwarfs. For a more massive prostar, the core temperature will eventually reach 10 million kelvins, initiating the proton-proton chain reaction and allowing hydrogen to fuse, first to deuterium and then to helium. The onset of nuclear fusion leads relatively quickly to a hydrostatic equilibrium in which energy released by the core exerts a "radiation pressure" balancing the weight of the star's matter, preventing further gravitational collapse. The star thus evolves rapidly to a stable state, beginning the main sequence phase of its evolution. A new star will fall at a specific point on the mai n sequence of the Hertzprung-Russell diagrams, with the main sequence spectral type depending upon the mass of the star. Small, relatively cold, low mass red dwarfs burn hydrogen slowly and will remain on the main sequence for hundreds of billions of years, while massive, hot super giants will leave the main sequence after just a few million years. A mid-sized star like the Sun will remain on the main sequence for about 10 billion years. . A star of less than about 0.5 solar mass will

Write an essay on a cultural issue as related to humanistic

Write an on a cultural issue as related to humanistic psychotherapy - - Essay Example the eighteen century had a dramatic transformation when the age of the industrial revolution started the latter did not just revolutionize the way we worked but most profoundly changed the structure of our societies and values where capitalism became the new god and the science replaced the religious beliefs that for a long time have been playing a supporting role for the people in need during difficult times.  Humanistic therapists emerged in the USA in the 1950s such as Maslow Abraham and Rogers Carl. These therapists formulated different humanistic theories and procedures for effective psychotherapy. Rogers delivered a speech in 1940 at the University of Minnesota about new concepts of psychotherapy that became the origin of humanistic psychotherapies. The American Psychological association (APA) launched the first journal on humanistic psychology in 1973. It is a professional organization representing psychology and consists of researchers, educators, physicians, consultants, a nd students. Culture may be defined as patterns of norms derived from traditions that influence personal behavior. These norms may include values, beliefs, customs, thoughts, and institutions such as religious, racial, ethnic and social groups. Cultural beliefs are passed from older generations to younger generations within a given society. Interaction with different cultures causes behavioral and psychological changes within an individual. Individuals migrating from one society to another have difficulty when adapting to the culture of the new society (Lago, 2006). Culture is not static, and interaction with other cultures may cause culture change. On the other hand, ethnicity can be defined as the sense of belonging to a group alienated to a particular society. Ethnicity is caused by social pressure and can only be resolved through psychological interventions. Race refers to the physical appearance of individuals as determined by the genetic composition. Humanistic therapy involves