Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
**Assertion A:** In the 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 the threshold frequency.
In the light of the above statements, choose the correct answer from the options given below:
Answer: (B) A is false but R is true
$eV_s = h\nu - \phi$: the stopping potential depends only on frequency, not on intensity. A is false.
Higher intensity (at fixed frequency above threshold) means more photons per second, so more photoelectrons per second. R is true.
Solution by Sreeraj P, M.Sc Physics