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  4. The work function of aluminium is 4.2 eV. If two photons, each of energy 3.5 eV strike an electron of aluminium, then emission of electrons will be

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Q. The work function of aluminium is $4.2\, eV$. If two photons, each of energy $3.5\, eV$ strike an electron of aluminium, then emission of electrons will be

Solution:

For emission of electrons incident energy of each photon must be greater than work function (threshold energy).