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.

1. A Both A and R are correct and R is the correct explanation of A.
2. B Both A and R are correct but R is not the correct explanation of A. Correct answer
3. C A is correct but R is not correct.
4. D A is not correct but R is correct.