Q. The number of photons emitted per second by a light source increases when:

  • (A) Frequency increases at constant power
  • (B) Power increases at constant frequency
  • (C) Wavelength decreases at constant power
  • (D) Temperature decreases
✅ Correct Answer: (B) Power increases at constant frequency
Explanation: The number of photons emitted per second is directly proportional to the power of the source when frequency remains constant.

Published by Jyoti ⭐ 1.79K Points at 15-Jun-2026 06:06 am in Physics

Explanation by: Jyoti
The number of photons emitted per second is directly proportional to the power of the source when frequency remains constant.

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