The neutrons produced in fission reactors have a wide range of kinetic energies. After the neutrons make several collisions with atoms, they give up their excess kinetic energy and are left with the same average kinetic energy as the atoms, which is  If the temperature of the reactor core is T = 400.0 K, find 

(a) The average kinetic energy of the thermal neutrons, and 

(b) The de Broglie wavelength of a neutron with this kinetic energy.

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KBT.