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When would we have to use the E = pc equation that is listed in the equations sheet and mentioned briefly in our notes? Can someone clarify for me in what problems/situations feature this equation? I don't think I've ever encountered it before in the homework.
E=pc is just an equation that relates momentum with energy. We used it in our notes to show how when used in conjunction with E=hv (which relates energy to frequency), we can derive De Broglie's wave equation. I think that we would only use E=pc in a problem if we were given the velocity of an electron and expected to find energy or vice versa.
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