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

Work function of a aluminium is 4.2 eV. Emission of photoelectron is possible if two photons, each of energy 2.4 eV, are incident on an aluminium plate.

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False: no emission of photoelectron is possible if energy of a single photon is less than the work function of photosensitive material.
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