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Electron velocity

  1. Feb 16, 2010 #1
    Two questions
    Both of these occur in a vacuum:
    If a photon has the exact energy to electron-positron pair product, since the electron and the positron are the same mass, if stationary would have an energy of Mc^2. Since they are moving would there energy be (of one fermion):


    If that is true does that mean the energy of the photon (in a vacuum) would be:


    Then, in a vacuum, would the electron and the positron collide? The second question is the previous one and what is velocity needed for anihilation?
  2. jcsd
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