Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): In photoelectric effect, on increasing the intensity of incident light the stopping potential increases. Reason (R): Increase in intensity of light increases the rate of photoele…

Question

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): In photoelectric effect, on increasing the intensity of incident light the stopping potential increases. Reason (R): Increase in intensity of light increases the rate of photoelectrons emitted, provided the frequency of incident light is greater than threshold frequency. In the light of the above statements, choose the correct answer from the options given below

Accepted Answer

(2) A is false but R is true.. Assertion: stopping potential follows eV₀=h
u-φ, which contains no intensity term. Raising the intensity sends in more photons per second but each photon still carries h
u, so Kₘₐₓ and V₀ are unchanged. The assertion is false. Reason: more photons per second above threshold do eject more electrons per second, raising the saturation current. The reason is true. So A is false and R is true.

Step-by-step solution

Why the other options are wrong