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De Broglie wave length

  1. Sep 28, 2015 #1
    1. The problem statement, all variables and given/known data
    Calculate the average electron energy of an electron in an electron gas at thermal equilibrium. Temperature is 315K. Calculate the average electron momentum. Calculate the de Broglie wave length of the electron

    2. Relevant equations
    3*kT/2

    3. The attempt at a solution

    Part 1) 3*(8.62*10^-5)*315K/2 = .0402 eV

    Part 2) I'm unsure of how to calculate average momentum. Should I use the mass of the electron?
     
  2. jcsd
  3. Sep 28, 2015 #2

    TSny

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    Hint: Momentum is a vector quantity.
     
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