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Compton effect and kinetic energy

  1. Aug 31, 2013 #1
    1. The problem statement, all variables and given/known data
    What is the maximum possible kinetic energy (keV) of a Compton electron and the corresponding minimum energy of a scattered photon resulting from scattering of

    a) 100 keV photon
    b) 1 MeV photon


    2. Relevant equations
    Δλ = 0.24(1-cosθ)


    3. The attempt at a solution
    Δλ = 0.24(1-(-1))
    = 0.48A

    I do not know how to figure the energy of the scattered photon
     
  2. jcsd
  3. Aug 31, 2013 #2
    Compton Scatter

    1. The problem statement, all variables and given/known data

    what fraction of the energy of a 1 MeV photon is lost if it Compton scatters through an angle of 90 degrees

    2. Relevant equations

    Δλv= 0.24(1-cosθ)


    3. The attempt at a solution
    Δλv= 0.24(1-cosθ)
    = 0.24(1-cos90)
    = 0.24(1-0)
    Δλ = 0.24A

    I am confused from here
     
  4. Aug 31, 2013 #3

    jtbell

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    Staff: Mentor

    OK, you've got the change in wavelength of the photon. What's the initial wavelength? (How do you find the wavelength of a photon given the energy?)

    Then, what's the final wavelength?
     
    Last edited: Aug 31, 2013
  5. Aug 31, 2013 #4

    jtbell

    User Avatar

    Staff: Mentor

    Threads merged. These two problems are actually rather similar, and you should be able to use basically the same technique to solve both of them. My hint applies to both of them.
     
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