Question

If the frequency of incident radiation is kept constant and the experiment is repeated by using incident light of different intensities, then stopping potential (\( V_s \))

• A. increases with increase in intensity.
• B. decreases with increase in intensity.
• C. depends upon current.
• D. remains same.

Hint:

In photoelectric effect problems, remember that the stopping potential depends on the frequency of light, not the intensity.

Answer 1

The Correct Option is D

Step 1: Understanding the Photoelectric Effect.
In the photoelectric effect, the stopping potential is determined by the energy of the incident photons, which is related to the frequency of the light, not the intensity. The intensity affects the number of emitted electrons but not their energy or the stopping potential.
Step 2: Analyzing the options.
(A) increases with increase in intensity: This is incorrect. Stopping potential does not depend on intensity but on the frequency of the incident radiation.
(B) decreases with increase in intensity: This is also incorrect for the same reason.
(C) depends upon current: While current depends on intensity (since more photons lead to more electrons), the stopping potential does not.
(D) remains same: This is correct. The stopping potential is independent of the intensity and depends solely on the frequency of the incident radiation.
Step 3: Conclusion.
The correct answer is (D) remains same, as the stopping potential is determined by the frequency, not the intensity.