Question

Some materials emit more photoelectrons than others - why?

Answer 1

In photoelectric emission, "The number of photoelectrons emitted per unit area per unit time is directly proportional to the intensity of light used." Is this true if the frequency is not held constant? If yes, please explain how. If a light of frequency f and intensity I emits n photoelectrons from a metal surface(of threshold frequency f/4) per unit area per unit time, how many photoelectrons will be emitted from the same metal surface per unit area per unit time when a lights of frequency and intensity 1)f/2, I 2)2f, 2I 3)f/2, 2I are separately used.