Question

The cut off potential is a function of a. The frequency of incident light
b. The intensity of incident light
c. The nature of Photosensitive substance used
d. The angle of incidence of incident light

Answer 1

Answer:

The number of photo electrons emitted per second from a photosensitive plate is directly proportional to the intensity of the incident radiation. For the same frequency of light and increased intensity, the saturation current is found to increase, but the cut-off potential is found to remain constant.

For the same frequency of light and increased intensity, the saturation current is found to increase, but the cut-off potential is found to remain constant.The number of electrons also changes because of the probability that each photon results in an emitted electron are a function of photon energy. If the intensity of the incident radiation of a given frequency is increased, there is no effect on the kinetic energy of each photo electron.