We were going over the basics of the photoelectric effect today in my solid state chemistry class when my instructor gave us a question asking what the wavelength of an ejected electron was. We worked through the question and got the answer, but that got me thinking. If the wavelength is: λ=h/p, or λ=h/(mv), what happens when the velocity of the electron is zero? The equation seems to imply that the wavelength goes to infinity as v approaches zero. What's going on there?