PhotoelectricEffect

PhotoelectricEffect - PHOTOELECTRIC EFFECT 1. When the tube...

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PHOTOELECTRIC EFFECT
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1. When the tube is kept in the dark I = 0. 2. When light strikes the metallic plate inside the tube you get a current. 3. This current arises from the electrons (photoelectrons) emitted with different kinetic energies by the metallic plate. 4. If the voltage between the plates is reversed, the photoelectrons will now be repelled by the negative collector plate. 5. If we gradually increase the potential until the highest energetic electrons are stopped, then I = 0: 2 max max 1 2 es Km v e V == 6. From graph (a) we see that I increases with light intensity. This was expected classically since higher intensity corresponds to more power per unit area or more energy per unit time and thus more electrons per unit time and thus the higher the current. 7. From graph (a) we also see that V s and thus K max are independent of the intensity of the light source. That is, increasing the rate at which energy strikes the metallic (emitting) plate does not increase K max . Classically, this completely unexpected.
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This note was uploaded on 09/02/2011 for the course PHYS 4D taught by Professor Luna during the Spring '11 term at DeAnza College.

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PhotoelectricEffect - PHOTOELECTRIC EFFECT 1. When the tube...

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