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Find the speed of an electron given momentum

  1. Aug 7, 2010 #1
    1. The problem statement, all variables and given/known data
    An electron has momentum of magnitude 2.74 10-22 kg · m/s. What is the electron's speed?
    2. Relevant equations
    p=ymv, where y=gamma


    3. The attempt at a solution
    v=p/m, which is wrong. Any suggestions?
     
  2. jcsd
  3. Aug 7, 2010 #2

    kuruman

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    If p = γmv, then v = p/γm not p/m. Of course, γ itself is a function of v, so you need to write it out and then solve for v correctly.
     
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