Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : The photoelectric effect does not takes place, if the energy of the incident radiation is less than the work function of a metal.
Reason R : Kinetic energy of the photoelectrons is zero, if the energy of the incident radiation is equal to the work function of a metal.
In the light of the above statements, choose the most appropriate answer from the options given below.

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

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

A is correct but R is not correct

A is not correct but R is correct

answer is B.

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Detailed Solution

To free the electron from metal surface minimum energy required, is equal to the work function of that metal
So Assertion A, is correct.
$hv = w_{0} + K . E_{\max}$
if hv = w₀
$\Rightarrow K \cdot E_{max} = 0$
Hence reason R, is correct, But R is not the correct explanation of A.