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Homework Help: Energy and bragg reflection

  1. Feb 24, 2015 #1
    1. The problem statement, all variables and given/known data
    A cubic crystal has a spacing between atoms of d = 0.2 nm. What is the minimum energy for X-rays such that non-trivial Bragg reflection may occur (peak with n =1)?
    Write your answer in units of keV.

    2. Relevant equations
    2dsinθ = nλ

    3. The attempt at a solution
    i have no idea what im doing. i dont remember the instructor talking about this nor can i find lecture notes on bragg reflection.
    the only reason i know the "relevant equation" is because of a class i took semester where we did an experiment to show bragg reflection.

    any advice would be appreciated. the second question is similar to this one.
  2. jcsd
  3. Feb 24, 2015 #2
    i found E = nhc/(2dsinθ)

    if 2dsinθ = nλ then i do this .... E = (n(nhc))/2d and just plug numbers in?
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