The spacing of the surface planes of a crystal is 159 pm. A beam directed normally at the surface of the crystal undergoes first order diffraction at an angle of 58° from the normal. The diffraction is done with a beam of monoenergetic neutrons
The energy of the neutrons is closest to: A) 0.045 eV
B) 0.039 eV
C) 0.050 eV
D) 0.056 eV
E) 0.061 eV
A
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