Question

Problem 4: In the photoelectric effect, photoelectrons sometimes leave the surface at es- sentially the instant that the light is turned on. This is in contrast to the classical picture, in which it would take a certain amount of time for enough energy to have been accumulated at the surface of the metal. Suppose that a very weak beam of light of wavelength λ and power W were to land on a piece of metal of work function ф, starting at time t-0. The irst photoelectron 1s observed at a time tET. How small must T be if the measurement is to be incompatible with the classical picture of light?

Answer 1

Based on classical theory W x T = a 0 > ?= 013 ţ Answer