Neutrons in thermal equilibrium with matter have an average kinetic energy of (3/2)kT, where k is the Boltzmann constant and T is the temperature in Kelvin. If liquid nitrogen is used to cool a container to 220.0 K, this can be used as the temperature of the environment of the neutrons.
A) What is the average kinetic energy of the neutrons? (eV)
B) What is the corresponding de Broglie wavelength?