a) What is the de Broglie wavelength of a neutron whose kinetic energy is eV? The mass of the neutron is 1.675 x 10-27 kg, or mc2 = 939.6 MeV.
l = nm
A beam of these neutrons is incident on a crystal. Scattering is observed, with the particular angles that the neutrons scatter off the crystal determined by interference effects between the waves scattered off different atoms. The smallest scattering angle found is F = ° from the initial direction as shown in the figure above.
b) What wave-length x-rays would scatter through the same angles from this crystal?
l = nm
c) What energy x-rays would scatter through the same angles from this crystal?
E = keV
d) The energy of the x-ray photon in part c is much larger than the neutron energy of xxxxx eV. What is the ratio of their momenta?
px-ray / pneutron =
