Solve the all parts of given question:
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.