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A Photon of Energy Hv is Absorbed by a Free Electron of a Metal with Work-function Hv − φ. - Physics

MCQ

A photon of energy hv is absorbed by a free electron of a metal with work-function hv − φ.

Options

  • The electron is sure to come out.

  • The electron is sure to come out with kinetic energy hv − φ.

  • Either the electron does not come out or it comes our with kinetic energy hv − φ.

  • It may come out with kinetic energy less than hv − φ.

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Solution

It may come out with kinetic energy less than hv − φ.

When light is incident on the metal surface, the photons of light collide with the free electrons. In some cases, a photon can give all the energy to the free electron. If this energy is more then the work-function of the metal,then there are two possibilities. The electron can come out of the metal with kinetic energy hv − φ or it may lose energy on collision with the atoms of the metal and come out with kinetic energy less than hv − φ. Thus, it may come out with kinetic energy less than hv − φ.

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APPEARS IN

HC Verma Class 11, Class 12 Concepts of Physics Vol. 2
Chapter 20 Photoelectric Effect and Wave-Particle Duality
MCQ | Q 3 | Page 364
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