4. If the mass of neutron is 1.7into 10 to the power _27kg then the de broglie wavelength of neutron of energy 3 ev is

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Q. If the mass of neutron

= 1.7 \times 10^{- 27} k g

. then the De broglie wavelength of neutron of energy

3 e V

is :

The energy of a neutron in eV whose de-Broglie wavelength is $1 0 A$

Q. de-Broglie wavelength of a neutron at

27^{\circ} C

λ

. Find energy of the neutron at

927^{\circ} C

(a) Obtain the de Broglie wavelength of a neutron of kinetic energy 150 eV. As you have seen in Exercise 11.31, an electron beam of this energy is suitable for crystal diffraction experiments. Would a neutron beam of the same energy be equally suitable? Explain. (m_n= 1.675 × 10⁻²⁷ kg)

(b) Obtain the de Broglie wavelength associated with thermal neutrons at room temperature (27 ºC). Hence explain why a fast neutron beam needs to be thermalised with the environment before it can be used for neutron diffraction experiments.

Q. De Broglie wavelength of neutrons in thermal equilibrium is (given

m_{n} = 1.6 \times 10^{- 27} k g)

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