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Homework Help: Compton effect photo scatterred

  1. May 28, 2014 #1
    1. The problem statement, all variables and given/known data

    A photon of wavelength 29 pm is scattered by a stationary electron. What is the maximum possible energy loss of the photon?
    (mass of electron = 9.11 × 10-31 kg, h = 6.626 × 10^-34 J · s, c = 3.00 × 10^8 m/s)

    3. The attempt at a solution

    After an hour or so, I'm not getting the right answer.

    29pm = 29x10-11m

    Ei = Ef + KE

    Ei - Ef = ΔE = h(c/Δλ)

    I set Θ = 180 and worked out

    λf = (h/mec)(1-cosΘ) + λi =

    ΔE = 6.626x10-34 (3x108/4.854212x10-12)
    = 4.095x10-14 j

    to convert to eV, i divided the above by 1.6 x10-16 but it doesn't give me the correct answer.
  2. jcsd
  3. May 28, 2014 #2
    Edit: I have it now.
  4. May 31, 2016 #3
    Hi, could you post your step by step solution? I cannot seem to get the answer
  5. May 31, 2016 #4
    Edit: I got it.
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