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The compton effect, need help

  1. Jun 25, 2007 #1
    1. The problem statement, all variables and given/known data
    In the compton effect a .150nm photon strikes a free staionary electron in a head-on elastic collision and knocks it into the foward direction. The rebounding photon recoils directly backwards. Use the collision conservation laws to find the final kinetic energy of the electron

    2. Relevant equations
    P = h/lambda
    Ek = 1/2mv^2

    3. The attempt at a solution

    All i know is i need the momentum of the photon which is p =h/lambda = 4.42e-24 kg m/s basically i just need to know how to find the speed of the elctron which i can sub into ek = 1/2mv^2
  2. jcsd
  3. Jun 25, 2007 #2
    would it not be c?
  4. Jun 25, 2007 #3
    is it, i didn't think that electrons could travel at c
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