Question

The frequency and intensity of a light source are both doubled. Consider the following statements.

(i) The saturation photo current remains almost the same.

(ii) The maximum kinetic energy of the photo electrons is doubled.

(A) Both (i) and (ii) are true

(B) (i) is true but (ii) is false

(C) (i) is false but (ii) is true

(D) both (i) and (ii) are false

Answer 1

Correct Answer is: (B) (i) is true but (ii) is false

Since frequency of light solurce is double, the energy carried by each photon will be doubled. Hence intensity will be doubled even if number of photons remains constant.Hence saturation current is constant.Since frequency is doubled, maximum KE increases but it is not doubled.