Photoelectrons from metal do not come out with same energy. Most appropriate explanation is:

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Some electrons loose energy in form of heat.

Work function of a metal is average energy required to pull out electrons.

Electrons in metal occupy different energy levels and work function is the minimum energy required for electron in highest level of conduction band to get out of metal.

For some electrons, some part of energy gained during inelastic collision with photon is spent in over coming attractive force by nucleus.

answer is C.

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Detailed Solution

Each electron in the atom occupies different energy levels but they occupy on the continuum energy levels. For the radiation of the same frequency, electrons are knocked out of different energy levels hence, have different energies.

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