Hey, I'm in my senior year of highschool and I'm stuck on this problem that deals with things I haven't even learned (Canadian education system for ya). It has to do with the photoelectric effect.

Given the wavelengths of an X-ray before and after it strikes an unknown metal, (initial=1.38e-11, final=1.54e-11), I have to determine the angle at which the X-rays scatter as well as the velocity of the ejected electrons. The electrons start at rest and I am to ignore any relativistic effects.

I can't figure out a way to solve without given the work function of the metal or the threshold frequency. Any help would be much appreciated!

Aleguan Feb 21, 2019