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Homework Help: Compton scattering and collision within blackbody

  1. Feb 9, 2013 #1
    1. The problem statement, all variables and given/known data
    Consider a blackbody contain atoms that typically produce photons with energy of about 7eV. Estimate the number of photon-electron collision each photon undergoes before it escape the object. Assume the blackbody has a temperature of 1000K.

    2. Relevant equations

    λ2 - λ1 = λcompton(1 - cosθ)

    3. The attempt at a solution

    Not sure if I have all relevent equation but this is what i did:

    calculated total kinetic energy by converting the temperature to kinetic energy using Boltzmann constant: kinetic energy=(3/2)KT. Then dived the total kinetic energy by 7eV
  2. jcsd
  3. Feb 10, 2013 #2
    I don't understand how this helps.

    How much energy does a single photon lose in a single Compton scattering? What is the average energy lost over multiple scatterings (with different angles θ)?
  4. Feb 10, 2013 #3
    Both were not given, but I assume 180 degree for max scattering?
  5. Feb 11, 2013 #4
    Assuming 180 degree angle is not entirely correct, but you can certainly do it like that, and it will give you at least a good order of magnitude estimate. Ideally you would like to take an average over all possible angles.
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