Question

Which of the following statements is correct regarding the photoelectric effect?

• A. For a given frequency of incident radiation, the stopping potential varies linearly with its intensity.
• B. For a given frequency of incident radiation, the photocurrent is independent of its intensity.
• C. For a given frequency of incident radiation, the maximum kinetic energy of photoelectrons is independent of its intensity.
• D. For frequencies below the cutoff frequency, photoemission can occur if intensity is slightly increased.

Hint:

Kinetic energy of photoelectrons depends on frequency, not intensity. Intensity affects photocurrent.

Answer 1

The Correct Option is C

According to Einstein’s photoelectric equation: \[ K_{\text{max}} = h\nu - \phi \] - Here, \( K_{\text{max}} \) depends only on the frequency \( \nu \), not on the intensity.
- Intensity affects the number of photoelectrons (i.e., photocurrent), but not their kinetic energy.
Thus, statement (3) is correct.