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Unformatted text preview: Shannon MacAdams Eric Kirchoff TA: Miaoyin (Kevin) Wang Physics 232, Section 232-006 Lab performed March 10, 2009 Lab due March 24, 2009 Lab Eight: Photoelectric Effect Introduction: The purpose of this lab is to study the photoelectric effect, measure the kinetic energy of the photoelectrons and compare it to the frequency of light used to eject the photoelectrons, and to measure the work function of the cathode in a photoelectric tube. Plancks constant expresses the theory that the energy difference, E, when an electron moves between different energy states (high low energy state: emission; low high energy state: absorption) is directly proportional to the frequency of the photon, v , that is emitted times its proportionality constant, h, known as Plancks constant (equal to 6.6x10-34 J-s): E=h v . Depending on the method of measurement, light is either characterized by its frequency ( v ) or wavelength () and therefore, knowing the speed of light (c=3x10 8 m/s): v =c/. For application of the photoelectric effect, studying the relation of the increasing number of electrons emitted to the increase in intensity found that the increase in intensity of light only had an effect...
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This note was uploaded on 04/07/2009 for the course PHYSICS 232 taught by Professor Mannella during the Spring '08 term at University of Tennessee.
- Spring '08