# A neutron beam of energy E scatters from atoms on a surface with a spacing d = 0.1nm.

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A neutron beam of energy E scatters from atoms on a surface with a spacing d = 0.1nm. The first maximum of intensity in the reflected beam occurs at θ = 30°. What is the kinetic energy E of the beam in eV?

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2d sinθ = λ = d =10–10 m.

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