Which one of the following is true in photoelectric emission

Options

A. Photoelectric current is directly proportional to the amplitude of light of a given frequency
B. Photoelectric current is directly proportional to the intensity of light of a given frequency at moderate intensities
C. Above the threshold frequency, the maximum K.E. of photoelectrons is inversely proportional to the frequency of incident light
D. The threshold frequency depends upon the wavelength of incident light

Answer

B