PHYSICS · Multi-part · A Level · Physics · Particles and radiation · Particles and radiation
Problem
The work function of a copper surface is 4.2eV.
(1) Determine the threshold frequency for the copper surface.
(2) Which part of the electromagnetic spectrum contains radiation just capable of producing photoelectrons from a copper surface?
(3) Calculate the maximum speed at which a photoelectron can leave the copper surface if it is illuminated with radiation of frequency 2.2×1015Hz.