1. The problem statement, all variables and given/known data A 35mW laser produces 526nm green light. What is the number of photons it emits each second? 1.9×1017 1.9×1018 1.0×1017 9.3×1016 2. Relevant equations 3. The attempt at a solution I've been playing with E=hf and lambda = h/p ----- no success! The text book im using doesn't have much on photons/photoelectric effect - nothing that helps me with this question at least. the "photon wavelength-momentum relation" is I think the most relevant to this question?? The text book doesn't actually say what p is so I assumed number of photons but thats wrong since it doesn't work. anyway need some help please.