Calculate the de-Broglie wavelength associated with thermal neutron at 27'C.

 

Solution:

 Temperature of neutron T = 27+273=300K

 De-Broglie wavelength in this case is given by

Where, h = Plank constant = 6.626x10^-34Js ,

 m= mass of neutron = 1.67x10^-27Kg

 K = Boltzmann constant = 1.38x10^-23J/ kelvin

Ans:  λ = 1.45 A⁰