When light is incident on a surface, photoelectrons are emi…

Physics Electron, Photon, Photoelectric Effect and X-rays Photon and Photoelectric Effect MCQ (Single Correct)

When light is incident on a surface, photoelectrons are emitted. For photoelectrons.

the value of kinetic energy is same

kinetic energy does not depend on the wave length of incident light

the value of kinetic energy is equal to or less than a maximum energy

kinetic energy does not depend on frequency of incident light.

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The correct answer is:

In the photoelectric effect, emitted electrons can have a range of kinetic energies from 0 to a maximum value given by

So kinetic energy depends on frequency and changes with wavelength, but each electron does NOT have the same kinetic energy. Only the maximum kinetic energy is fixed for a given frequency.

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