Physics - Old Questions
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9. In neutron spectroscopy a beam of monoenergetic neutrons is obtained by reflecting reactor neutrons from a beryllium crystal. If the separation between the atomic planes of the beryllium crystal is 0.732 Å , what is the angle between the incident neuton beam and the atomic planes that will yield a monochromatic beam of neutrons of wavelength of wavelength 0.1 Å?
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