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!