Question

Assertion (A): Photoelectric current depends upon the intensity of the incident radiation.

Reason (R): Stopping potential is independent of the intensity of the incident radiation.

विकल्प

• Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).

• Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).

• Assertion (A) is true, but Reason (R) is false.

• Both Assertion (A) and Reason (R) are false.

Answer 1

Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).

Explanation:

From the photoelectric effect:

K_max = hv − ϕ

• Photoelectric current depends on the number of electrons emitted.
• The number of emitted electrons depends on the intensity of the incident light.
• Stopping potential is related to the maximum kinetic energy of the electrons.

Analyze Assertion

When intensity increases, the number of incident photons increases, which leads to more emitted electrons.

Photoelectric current ∝ Intensity

Therefore, Assertion (A) is true.

Analyze Reason

Stopping potential is given by:

eV₀ = K_max = hν − ϕ

It depends only on the frequency of the incident light and not on its intensity.

Hence, Reason (R) is true.