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The work function of a metal is 4.2eV. Two photons of each energy 2.5eV each strike an electron of the metal. Then

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the electron emitted with zero energy

none of the above

electron is emitted with increased energy

electron is not emitted

answer is B.

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Detailed Solution

electron is not emitted

As energy of photon is less than workfunction. Therefore no photon is emitted

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