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Homework Help: What is the max E that teh electron can obtain?

  1. Sep 27, 2011 #1
    A photon having 20 keV scatters from a free electron at rest. What is the maximum energy that the electron can obtain?

    2. Relevant equations
    [itex]\lambda[/itex]' - [itex]\lambda[/itex] = (h/mc)(1-cos(theta)

    3. The attempt at a solution
    i just dont know where to get started or anythign can someone show me how to do this?
  2. jcsd
  3. Sep 27, 2011 #2
    Do you know what happens when the scatter angle is 0 degrees, 90 egrees, and 180 degrees?
  4. Sep 27, 2011 #3
    no thats why i dont get how to do this.
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