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)


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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