From the photoelectric effect experiment, following observations are made. Identify which of these are correct
A. The stopping potential depends only on the work function of the metal.
B. The saturation current increases as the intensity of incident light increases.
C. The maximum kinetic energy of a photo electron depends on the intensity of the incident light.
D. Photoelectric effect can be explained using wave theory of light.
Choose the correct answer from the options given below:
A. The stopping potential depends only on the work function of the metal.
B. The saturation current increases as the intensity of incident light increases.
C. The maximum kinetic energy of a photo electron depends on the intensity of the incident light.
D. Photoelectric effect can be explained using wave theory of light.
Choose the correct answer from the options given below:
- (A)B, C only
- (B)A, C, D only
- (C)B only✓ Correct
- (D)A, B, D only
Answer: (C)
Solution
The stopping potential is set by , so it depends on the frequency as well as the work function, and the first claim fails. Raising the intensity sends in more photons per second and lifts the saturation current, so the second claim holds. The maximum kinetic energy is governed by frequency and not by intensity, so the third claim fails, and the effect cannot be accounted for by wave theory but needs the photon picture, so the fourth fails. Only the statement about saturation current is correct.
JEE Main · 2023 · 24 Jan 2023 · Shift 1 · Single correct option