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Energy in QM

  1. Jun 20, 2007 #1
    What is the difference between formulas E=p^2/2m and E= hf ?
  2. jcsd
  3. Jun 20, 2007 #2
    You cannot understand a formula without its context. The first E in reality means: Energy of a non-relativistic, non-interacting, classical particle. The second E refers to the energy of a non-interacting, quantum photon.
  4. Jun 20, 2007 #3


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    p^2/2m is non-relativistic kinetic energy
    E=hf usually means total energy of a photon
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