I just need help with B and C please thank you The HighResol

I just need help with B and C please. thank you!

The High-Resolution Powder Diffractometer, beamline BT-1 at the National Institute for Standards and Technology (NIST), utilizes neutrons with a wavelength of 2.079 A. The mass of a neutron is 1.67 times 10^-27 kg. Calculate the frequency and velocity of the neutrons used in this experiment. Calculate the energy of the neutrons used in this experiment. X-ray techniques are very powerful and often have better resolution than neutron experiments. However, there are sometimes concerns that the high energies associated with x-ray experiments can cause damage to sensitive biological samples, and you will often read arguments that neutron experiments are a \"more gentle\" means of probing the structure of sensitive materials. Compare the energy you calculated in part (b) for the NIST neutron diffractometer with the energies in the x-ray crystallography beamline from problem 1. Is this argument reasonable?

Solution

b) = h/(2Em)

E = h²/2²m = (6.63x10-34)2/(2x2.079²x10^-20x1.67x10^-27) = 19.03meV

c) As problem 1 is not given. So as per my knowledge, the energy in the x-ray crytallography beamline is much higher than is energy calculated above for neutrons. However relatively large amounts of samples are needed: typically 1 mm-thickness and 1 cm diameter samples are needed for SANS measurements. This is a difficulty when using expensive deuterated samples or precious (hard to make) biology specimens. So the argument given in part c is not reasonable.