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X-ray reflection/Bragg's law help?

  1. [SOLVED] X-ray reflection/Bragg's law help??

    1. The problem statement, all variables and given/known data
    The planes of atoms in a cubic crystal lie parallel to the surface, 0.81 nm apart. X rays having wavelength 0.37 nm are directed at an angle θ to the surface.

    (a) For how many values of θ will there be a strong reflection?
    (b) What is the largest value of θ that gives a strong reflection?

    (c) What is the second largest value of θ that gives a strong reflection?

    (d) What energy electrons could give the same result?

    2. Relevant equations
    Bragg's Law n[tex]\lambda[/tex]=2*d*sin[tex]\Theta[/tex]

    3. The attempt at a solution
    So I guessed for the answer for part a, I found some things online that had 4 angles, but I have no idea how to find the angles?? Can anyone explain to me what a strong reflection actually is and how to find it?
  2. jcsd
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