A monochromatic light source of frequency illuminates a metallic surface and ejects…
PHYSICS · Multi-part · A Level · Physics · Particles and radiation · Particles and radiation
Problem
A monochromatic light source of frequency f illuminates a metallic surface and ejects photoelectrons. The photoelectrons with maximum energy are just able to ionize hydrogen atoms in the ground state. When the experiment is repeated with incident radiation of frequency 65f, the emitted photoelectrons excite the hydrogen atom beam, which then emits radiation of wavelength 1215A˚.
(a) What is the frequency of the radiation?
(b) Find the work function of the metal.