Question

Photoelectric effect is the phenomenon in which:

A

photon comes out of a metal when it is hit by a beam of electrons.

B

photons come out of the nucleus of an atomic under the action of an electric field.

C

electrons come out of a metal with a constant velocity which depends on the frequency and intensity of incident light we have.

D

electrons come out of metal with different velocities not greater than a certain value which depends only on the frequency of the incident light wave and not on its intensity.

Medium

Solution

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Correct option is D)

Total energy PE + KE
KE T(total energy)
So, velocity cannot be greater than velocity corresponding to KE.
The photoelectric effect refers to the emission, or ejection, of electrons from the surface of, generally, a metal in response to incident light. The energy contained within the incident light is absorbed by electrons within the metal, giving the electrons sufficient energy to be 'knocked' out of, that is, emitted from, the surface of the metal.

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