The work function of a metal is 4.2eV.Two photons of each energy 2.5eV each strike an electron of the metal then 1) the electron emitted with zero energy 2) Electron is not emitted 3) electron is emitted with increased energy 4) none of the above

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Solution

Dear student
Work function is defined as the minimum amount of energy required by an electron to escape from a metal surface
Since energy of incident photon is less than work function an electron will not be ejected from the metal surface.

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