GRE Physics GR1777, Problem 010 Solution

GRE Physics GR 1777 Problem Solution

10. Quantum Mechanics (Photoelectric effect)


The maximum kinetic energy of the emitted electrons is
$latex E_{max} = h\\nu -w$,
where $latex E_{max}$ is the maximum kinetic energy of the emitted electrons from the metal surface, $latex \\nu$ is the frequency of light, and $latex w$ is the work function of the metal.

Also, if we want to stop the emitted electrons, we should put some potential difference onto them. Thus, the previous equation becomes
$latex E_{max} = h\\nu -w = qV$,
where $latex q$ is the electric charge, in this problem, should be $latex e$. In this equation, we can prove that the potential difference is a linear function of the frequency.




Leave a Reply

Your email address will not be published. Required fields are marked *