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Homework Help: Magnitude of the energy for interference maxima

  1. Sep 22, 2008 #1
    1. The problem statement, all variables and given/known data

    Consider a crystal with planar spacing 3.2 A0. What order of magnitude of energies would
    one need for (a) electrons, (b) helium nuclei (mass = 4*proton mass) to observe up to three
    interference maxima?

    2. Relevant equations

    2d.sinx = n.lambda (I)
    lambda = h / p (II)
    E = (1/2)mv22

    3. The attempt at a solution

    To solve this question, I thought I must first find the wavelength and can use other equetions that I wrote above. Actually, I don't know how I can use them but since in the question, mass is important, I thought an equation with mass can work.
  2. jcsd
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