Assertion (A) : Work function of aluminium is 4.2 eV. Emission of electron will not be possible if two photons each of energy 2.5 eV strike an electron of a aluminium.
Reason (R) : For photoelectron emission the energy of each photon should be greater than the work function of metal.

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Both A and R are true and R is the correct explanation of A

Both A and R are true and R is not the correct explanation of A

A is true and R is false

A is false and R is true

answer is A.

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Detailed Solution

$E = W + E a n d E \geq W$

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