Sample Paper – 2008 Class – Physics Class – XII Dual nature of matter Q.1. State the dependence of work function on kinetic energy of electrons emitted in a photocell. If the intensity of incident radiation is doubled‚ what changes occur in the stopping potential and photoelectric current? Q.2. How does the maximum kinetic energy of the emitted electrons vary with the work function? Q.3. the frequency of incident radiation is greater than the threshold frequency in a photocell. How
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THE NATURE OF LIGHT Until the time of Isaac Newton (1642–1727)‚ most scientists thought that light consisted of streams of particles (called corpuscles) emitted by light sources. Galileo and others tried (unsuccessfully) to measure the speed of light. Around 1665‚ evidence of wave properties of light began to be discovered. By the early 19th century‚ evidence that light is a wave had grown very persuasive. In 1873‚ James Clerk Maxwell predicted the existence of electromagnetic waves and calculated
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The Maxwell’s equations of electromagnetism and Hertz experiments on the generation and detection of electromagnetic waves in 1887 strongly established the wave nature of light. Towards the same period at the end of 19th century‚ experimental investigations on conduction of electricity (electric discharge) through gases at low pressure in a discharge tube led to many historic discoveries. The discovery of X-rays by Roentgen in 1895‚ and of electron by J. J. Thomson in 1897‚ were important milestones
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define what is light‚ speed of light‚ and ray; 3. cite different sources of light; 4. explain how the two types of shadows formed; 5. manifest awareness of the nature of light in our daily life; and B. answer three out of five items correctly. II. SUBJECT MATTER: A. Unit: Electricity Chapter: Interaction of Electric Charges Topic: Nature of Light 1. Concepts: • Light is an electromagnetic wave‚ a form of energy that can travel freely across space. The speed of light is 3.0X108 m/s
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position without crossing boundaries while avoiding dual relationships from forming. For example‚ a close friend of yours is having difficulty with her teenage daughter. She knows you are a psychologist who specializes in adolescents. She asks if you would be willing to see her daughter for a few sessions to straighten her out. Pope asks "What would each person consider the most ethical response?"The first problem given this scenario‚ there is already a dual relationship that is beginning because the therapist
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The Effects of the Human Mind on an Individual Nature is complex and results to the ornate workings of the human mind. Theories can be explained through Sigmund Freud’s scientific analysis and experiments. His theory of repression is expressed by the parts of the human mind: id‚ ego‚ and superego. Complications of the mind are responsible for split personality and dual nature of man which allows contradicting natures to coexist in one man. In the novella‚ The Strange Case of Dr. Jekyll and Mr.
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Dual nature of Mr. Scratch in “The Devil and Daniel Webster” In the guise of Mr. Scratch‚ the Devil appears as one of the title characters in Benet’s short story “The Devil and Daniel Webster”. Traditionally‚ the Devil has been depicted as a fearsome figure. However‚ different from the frightening devils in other stories‚ Mr. Scratch seems to have a dual nature‚ which combines frightening and comical characteristics. With respect to his frightening characteristic‚ firstly‚ even if he is
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considered a big patron of the arts. He was the creator of wine and spread the art of viticulture‚ which is basically the study of grapes and their cultivation. Dionysus had a dual nature; on one side‚ he brought joy and divine ecstasy‚ on the other hand he would bring brutality and blinding furious rage. Thus he reflected on the dual nature of wine most of the time. Bacchus was the son of Zeus and thebe Princess Semele‚ he was most likely the only roman god‚ whose parents we both not born devine. While other
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Dual Relationships and Boundaries Dual relationships are defined as both therapeutic and personal relations that occur between a client and professional therapist (Pope & Keith-Spiegel‚ 2008). Although they are relatively easy to define‚ it also can be difficult for professionals to recognize that a dual relationship has occurred in his or her practice. When a therapist does enter another noticeably different relationship with a client‚ a dual relationship has occurred (Pope‚ 1997). Some
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this information. It is from our migrants‚ including dual citizens that Jamaica receives remittances to bolster our economy. While there are benefits that the country can enjoy from these dual citizens‚ Jamaicans holding dual citizenship should not be allowed to hold positions in parliament. Loyalty and allegiance are qualities that a Member of Parliament (MP) should portray towards the country he or she serves. For a Parliamentarian to hold dual citizenship‚ it allows for persons to question his
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