Q 12-11-013NEETNEET 2020Top questionEasy
Light of frequency $1.5$ times the threshold frequency is incident on a photosensitive material. What will be the photoelectric current if the frequency is halved and intensity is doubled ?
Answer: (D) zero
New frequency: $\dfrac{1.5\nu_0}{2} = 0.75\nu_0$, which is below the threshold frequency.
No photoelectrons are emitted at any intensity, so the photocurrent is zero.
Solution by Sreeraj P, M.Sc Physics