The Spacing of the Atoms of a Crystal Is 159

Multiple Choice

The spacing of the atoms of a crystal is 159 pm.A monoenergetic beam of neutrons directed normally at the surface of the crystal undergoes first order diffraction at an angle of 58° from the normal.What is the energy of each of the neutrons? (m_neutron = 1.675 × 10^-27 kg,1 eV = 1.6 × 10^-19 J,h = 6.626 × 10^-34 J ∙ s)

A) 0.045 eV
B) 0.039 eV
C) 0.050 eV
D) 0.056 eV
E) 0.061 eV