Hi all. This is my first post. I'm a little eluded by this question given to me... "What does the photoeffect (photo-electric effect) tell about electrons bound in metals" It seems a bit too trivial to me. I'm tempted to just say that since the work function is proportional to how "bounded" the electrons are to the metal, bounded electrons will not be ejected compared to the metal's free electrons. Therefore, bound electrons will not transfer energy in the metal. Do I even make sense, maybe I'm missing something else? I was also working on phonons in the same assignment, but if there is a relation to the photoeffect besides energy transfer, I can't see it.