Question

Stopping voltage. What is being stopped? Why is this voltage times e = 1.6x10-19 equal to the maximum electron energy of an electron leaving the surface of the metal? Explain.

Answer 1

First of all let me tell you that the stopping potential is the concept related to the photoelectric effect. During the emission of photoelectrons the potential required to to stop the fastest moving electron is called stopping potential.

by applying the strong potential we decrease the energy of fastest moving electron to zero so that it stops. As we know that when a charge move through a potential difference the change in it energy is charge X potential difference. in this case the charge is electron and it moves through the potential difference of a stopping potential hence it is equal to eV​​​​​stopping potential