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Homework Help: Photon and Electron Collision

  1. Apr 15, 2009 #1
    1. The problem statement, all variables and given/known data

    An incident photon having a frequency of 2.00 E10^19 Hz collides with an electron initially at rest.

    What is the total energy of the two-particle system after the collision? (In joules

    3. The attempt at a solution

    I've stared at this problem for at least an hour an have no idea where to go from here. Can anyone give me a leg up on this one. It feels like there isn't enough given information to even begin this... no velocity, no wavelength.

    Thanks in advance!

  2. jcsd
  3. Apr 15, 2009 #2
    Well, to be fair... it's a photon, so you know the velocity (ie. the speed of light), and since you have the frequency, you have the wavelength - perhaps you can see it from there?
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