Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R:

Assertion A: The kinetic energy of photoelectrons increases with increase in frequency of incident light.

Reason R: The number of photoelectron ejected increases with increase in intensity of light.

In the light of the above statements, choose the most appropriate answer from the options given below:

Both A and R are correct but R is NOT the correct explanation of A

The correct answer is option 4. Both A and R are correct but R is NOT the correct explanation of A.

Assertion (A) states that the kinetic energy of photoelectrons increases with an increase in the frequency of incident light. This statement is correct and is in accordance with the photoelectric effect. According to the photoelectric effect, the kinetic energy of photoelectrons ejected from a metal surface is directly proportional to the frequency of the incident light.

Reason (R) states that the number of photoelectrons ejected increases with an increase in the intensity of light. This statement is also correct. According to the photoelectric effect, the number of photoelectrons ejected from a metal surface is directly proportional to the intensity of the incident light.

While both statements are individually correct, Reason (R) does not provide the correct explanation for Assertion (A). The kinetic energy of photoelectrons is primarily determined by the frequency of the incident light, not the intensity. Therefore, the correct answer is option 4.