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

Possible

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Not possible

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Data is incomplete

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Depend upon the density of the surface

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Solution

The correct option is B
Not possible

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

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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

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

4.2 e V .

2.5 e V,

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