NEET | 2017Wave motionHard

Question

The de-Broglie wavelength of a neutron in thermal equilibrium with heavy water at a temperature T (Kelvin) and mass m, is :-

Options

A.

h3mkT

B.

2h3mkT

C.

2hmkT

D.

hmkT

Solution

Kinetic energy of thermal neutron with equilibrium is 32 KT
λ=hmv=h2m K.E=h2m32KT=h3 mKT

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