The Spacing of the Atoms of a Crystal Is 159

question 12

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

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