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Question: A beam of thermal neutrons is extracted from a nuclear reactor and is incident on a crystal. The beam is bragg scattered from a crystal whose scattering planes are separated by 0.247nm. From the continuous energy spectrum we wish to select neutrons of energy 0.0105eV.

Part A: Find the bragg scattering angle that results in a scattered beam of energy.

Part B: Will other energies be present?

I need tutor help to solve the above question and take the rest mass of the neutron to be 939.56 MeV.

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