The photoelectric current is directly proportional to the number of photo electrons emitted per second. This implies that
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → the number of photoelectrons emitted per second is directly proportional to the intensity of incident radiation.
In the photoelectric effect, for radiation above the threshold frequency, the photoelectric current is proportional to the intensity of the incident radiation. A larger intensity means more photons per second, and each photon ejects at most one electron. So the number of photoelectrons emitted per second rises in direct proportion to the intensity.
Option (3) the number of photoelectrons emitted per second is directly proportional to the intensity of incident radiation. — Correct. Photocurrent, number of photoelectrons per second and intensity are all directly proportional.
NCERT (2026-27):
Effect of Intensity of Light on Photocurrent – “… It is found that the photocurrent increases linearly with intensity of incident light as shown graphically in Fig. 11.2. The photocurrent is directly proportional to the number of photoelectrons emitted per second. This implies that the number of photoelectrons emitted per second is directly proportional to the intensity of incident radiation.”