Question

Green light ejects photoelectrons from a given photosenstive surface where as yellow light does not. What will happen in case of violet and red light? Give reason for your answer.

Answer 1

The photoelectrons can be emitted from a metal surface if the frequency of incident radiation is surface if the frequency of incident radiation is more than threshold frequency, i.e., more than that of green light for the given surface. As frequency of violet light is more than that of green light, hence violet light will ejected photoelectrons. But the frequency of red light in can not eject photoelectrons from the given surface.