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Photon, energy and electrons

  1. Oct 10, 2005 #1
    how do you prove that it is impossible for a photon to give up all its energy and momentum to a free electron?
  2. jcsd
  3. Oct 10, 2005 #2


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    Staff: Mentor

    Set up the equations for conservation of energy and momentum and try to solve them for the energy and momentum of the electron after the absorption. For simplicity assume that the electron is initially stationary.
  4. Oct 10, 2005 #3
    ok, thanks! ill try that~
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