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E = hf

  1. Mar 20, 2017 #1
    1. The problem statement, all variables and given/known data
    Is this E - say of an electron - the very E in E2 = (mc2)2 + (pc)2?

    If it isn't, what sort of Energy is this?

    Help is greatly appreciated!

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Mar 20, 2017 #2


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    This is the E of a photon, a massless particle. So yes:
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