Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Number of photons increases with increase in frequency of light.
Reason R: Maximum kinetic energy of emitted electrons increases with the frequency of incident radiation.
In the light of the above statements, choose the most appropriate answer from the options given below:

Question

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

Assertion A: Number of photons increases with increase in frequency of light.

Reason R: Maximum kinetic energy of emitted electrons increases with the frequency of incident radiation.

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

G1 Physics · Accepted Answer

For light of fixed intensity: I = nhν/A Therefore: n = IA/(hν) So the number of photons decreases when frequency increases. Hence Assertion A is incorrect. For photoelectric emission: K(max) = hν - ϕ Thus maximum kinetic energy increases with frequency. Hence Reason R is correct. Therefore, Option D is correct.