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.A, B, D only
- B.B, C only
- C.B only
- D.A, C, D only
Show answer and solution
Correct option: C
Solution
The saturation current depends on the number of photoelectrons emitted per second, which increases with intensity — so B is correct. Stopping potential depends on maximum KE, which equals hf − φ (frequency and work function), not intensity alone, making A wrong. Maximum KE depends on frequency of incident light, not intensity, making C wrong. The photoelectric effect cannot be explained by wave theory (it requires photon/quantum theory), making D wrong. Therefore only B is correct.
[JEE Main 2023 · 24 Jan · Shift 1 · Paper-1(B.E./B. Tech.)]