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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

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a

Possible

b

Not possible

c

Depend upon the density of the surface

d

Data is incomplete

answer is B.

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Detailed Solution

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

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