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Help with Masive photons

  1. Aug 21, 2011 #1
    1. The problem statement, all variables and given/known data
    This is my problem:

    (5th part is not needed)

    The problem is I took a bit too complicated course for me and I don't know how to solve this. Specially I need help with 3rd and 4th parts. I will very much appreciate the help.
    Thank you in advance.
  2. jcsd
  3. Aug 22, 2011 #2
    The two first parts I maneged to do, but don't really know how to do the 3rd and 4th. Could anybody help?
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