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Homework Help: Relativity and energy (think its dead easy, I just can't see it!)

  1. May 30, 2007 #1
    1. The problem statement, all variables and given/known data
    A proton has total energy 2GeV and is travelling along the x-axis. A photon with energy 50MeV travels at an angle of 45 degrees to this axis. What is the total energy and momentum of the system?

    2. Relevant equations

    3. The attempt at a solution
    Total E = 2Gev + 50 MeV = 2.05GeV yes? I don't need to take any directions into account here do I?

    Then px = p(proton) + px(photon), and py = py(photon) yes?
  2. jcsd
  3. May 30, 2007 #2


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    Yes, that's it.
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