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A question regarding particle diffraction.

  1. Jan 29, 2013 #1
    1. The problem statement, all variables and given/known data
    "A beam of neutrons that emerges from a nuclear reactor contains neutrons with a variety of energies. To obtain neutrons with an energy of 0.050 eV, the beam is passed through a crystal whose atomic planes are 0.20 nm apart. At what angles relative to the original beam will the desired netruons be diffracted?"


    2. Relevant equations
    Braggs law
    mλ=sin2θ


    3. The attempt at a solution
    My first thought was to use braggs law and simply solve for θ and m=1,2,3... but θ>90degrees.
    However the problem seems alot more complex than that. My book doesn't have any answers to the question so I can't double check if I have done this right!
     
  2. jcsd
  3. Jan 29, 2013 #2

    mfb

    User Avatar
    2016 Award

    Staff: Mentor

    Looks like a calculation error.

    Did you calculate the wavelength of those neutrons?
     
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