In a photoelectric experiment, when radiation of wavelength λ and of intensity I is incident on a metal plate, saturation current and stopping potential are found to be i and v0. If the intensity of incident radiation is 2I then saturation current and stopping potential are respectively.

For a given wavelength the number of photo electrons ejected from the metal plate is directly proportional to the intensity of incident radiation. Also saturation current is directly proportional to the number of photo electrons ejected. Stopping potential (v0) depends upon the wavelength of incident radiation hcλ=ϕ+ev0 it does not depend upon intensity of radiation.