Question

1. in photoelectricity, the number of electrons emitted per second from a metallic surface is proportional to the

a. work function of the metal.
b. frequency of the incident radiation.
c. energy of the incident radiation.
d. intensity of the incident radiation.

Explanation:

In the photoelectric effect, the number of electrons emitted per second (photocurrent) depends on the number of photons striking the metal surface per second. The intensity of incident radiation is related to the number of photons (higher intensity means more photons). The work function determines the minimum energy to eject an electron, frequency/energy of radiation determines if electrons are ejected (and their kinetic energy), not the number of electrons emitted per second. So the number of electrons emitted per second is proportional to the intensity of incident radiation.

Answer:

D. intensity of the incident radiation.