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Homework Help: 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

    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


    User Avatar
    2017 Award

    Staff: Mentor

    Looks like a calculation error.

    Did you calculate the wavelength of those neutrons?
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