In the photoelectric effect, electromagnetic radiation incident on a metal surfa

Question

In the photoelectric effect, electromagnetic radiation incident on a metal surface may eject electrons, but only if the frequency of the radiation exceeds a threshold value. Show that this frequency threshold can be understood if the mechanism for the photoelectric effect involves an interaction between a photon and an electron, and if the energy needed to eject the electron has a minimum value. The minimum energy needed to eject an electron from the surface of magnesium is 3.68 eV. Show that light with a frequency below 8.89x10^14 Hz cannot produce photoelectrons from magnesium, no matter how intense the illumination may be.

Explanation / Answer

Ans:- The instant that light with an appropriate frequency of any intensity strikes a photoemissive surface, at least one electron will always pop out immediately (

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