A photon of energy hv is absorbed by a free e | vedclass

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Question

(D) When a photon of energy $hv$ is absorbed by an electron inside a metal,the electron may lose some of its energy due to collisions with other atoms

Vedclass · Accepted Answer

It may come out with kinetic energy less than $hv - \phi$.

Vedclass · Answer

(D) When a photon of energy $hv$ is absorbed by an electron inside a metal,the electron may lose some of its energy due to collisions with other atoms or electrons before reaching the surface. If the electron is at the surface and absorbs the photon,it will be emitted with the maximum kinetic energy $K_{max} = hv - \phi$. However,if the electron is located below the surface,it will lose some energy during its journey to the surface. Therefore,the electron may either not come out at all (if it loses too much energy) or it may come out with a kinetic energy less than $hv - \phi$. Thus,the correct statement is that it may come out with kinetic energy less than $hv - \phi$.

$A$ photon of energy $hv$ is absorbed by a free electron of a metal having work function $\phi < hv$.

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