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Velocity and momemtum of 10 Mev Electron

  1. Sep 22, 2008 #1
    1. The problem statement, all variables and given/known data

    Find the velocit y and momentum of an electron (rest mass of 0.511MeV) with a
    kinet ic energy of 10.0 MeV.

    3. The attempt at a solution

    The momentum I calculate using sqrt(2KEm) is giving me a V larger than the speed of light. This can't be true.

    If I try
    Rest E + KE = sqrt (m2c4 - p2c2) it gives me a negative root.
     
  2. jcsd
  3. Sep 22, 2008 #2
    Nevermind, I figured it out.
     
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