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Homework Help: Electron Energy

  1. Feb 18, 2008 #1
    1. The problem statement, all variables and given/known data
    "Mono-energetic electrons are diffracted by a lattice. Their wavelength is shown to be L=0.35nm. What are the energies of the electrons?"

    2. Relevant equations



    3. The attempt at a solution

    c/L gives 8.566exp17


    I plug them in and get: 5.66exp-19 J

    The answer is 1184.4 kJ mol -1.

    So I divide my answer by 1000, and multiply it by Avogadros number. But my answer is nowhere near the actual answer. Where am I going wrong?
  2. jcsd
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