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Work function of aluminium is 4.2 eV.If ...

Work function of aluminium is 4.2 eV.If two photons, each of energy 2.5 eV, are incident on it surface, will the emission of electrons take place? Justify your answer.

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In photoelectric effect, a single photon interacts with a single electron.As individual photon has energy ( 2.5 eV ) which is less than work function, hence emission of electron will not take place.
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