Answer :

De- Broglie wavelength, λ = 1.447 × 10-10 m


Room temperature, T = 300K


The average KE of neutron is given as,


KE = 3/2 KT …(3)


Where,


K = Boltzmann constant = 1.38 × 10-23 Jmol-1K-1


From equation 2,



Using equation (3) we can write,



By putting values in above equation we get,



λ = 1.447 × 10-10 m


Now, the wavelength has come into comparable range with the inter-atomic spaces, it is now suitable for diffraction. Hence a beam should be thermalized before using for diffraction.


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