Q.

The photoelectrons emitted from a metal surface

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a

have the same kinetic energy

b

are all at rest

c

have the same momentum

d

have speeds varying from zero up to a certain maximum value.

answer is D.

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Detailed Solution

The electrons after receiving the energy from photon, may loose energy to the metal in course of collisions with the atoms of the metal. The actual kinetic energy of such an electron will depend on the total energy lost in collisions. So, the actual kinetic energy of the photoelectron coming out may be anything between zero and certain maximum value.

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