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Homework Help: X-Ray Diffraction

  1. Feb 2, 2010 #1
    1. The problem statement, all variables and given/known data
    An X Ray beam (wavelength 10^10m) is incident upon a sample of a powdered crystalline material. At a distance of 5m from the sample a flat detecting film has been placed. A pattern of 2 circles have been recorded on this film (radius 2cm and 3.5cm).

    What crystal spacing does this pattern correspond to?

    2. Relevant equations
    I'm not sure but:

    mλ = 2dsinθ

    (The reason I am unsure as that is for solid crystals not powder)

    3. The attempt at a solution

    So far I ahve calculated the angles the circles are at to the beam:

    tan θ = 2/5 so θ = 22 degrees

    tan θ = 3.5/5 so θ = 35 degrees

    Next I tried putting them both into the above equation trying to calculate d but that makes little sense to me.

    Anyone able to help?
  2. jcsd
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