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Wave Optics

Question

The thermal neutrons in a nuclear reactor may be regarded as a gas at a temperature T°K which obeys the laws of kinetic theory. Then the de-Broglie wavelength of such thermal neutrons in terms of temperature T₁ mass of neutron m is given by
$λ = \frac{h}{\sqrt{3 mKT}}$
$λ = \frac{λ}{\sqrt{6 mKT}}$
$λ = \frac{λ}{\sqrt{5 mKT}}$
$λ = \frac{λ}{\sqrt{2 mKT}}$

Solution

λ = \frac{h}{\sqrt{3 mKT}}