Q. 32 A4.6( 5 Votes )

# Obtain the de Bro

Given:

Kinetic energy of neutron, E = 150 eV = 150 × 1.6 × 10-19

E = 2.4 × 10-17 J

Mass of neutron, mn = 1.675 × 10-27 Kg

Kinetic energy of a particle is given by,

We can write,

mv = (2 × m × KE)0.5

P = (2 × m × KE)0.5 ...(1)

Where,

m = mass of electron

v = velocity of electron

p = momentum of particle

By putting the equation (1) in de- Broglie equation, we get,

…(2)

Now substituting the values in eq (2) we get,

λ = 2.327 × 10-12m

A neutron cannot be used in diffraction experiment as lattice spaces are of the order of few 10-10 m, whereas the wavelength of a neutron beam is 100 times smaller.

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