The energy of thermal neutron is about :

25 M e V

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0.51 M e V

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25 m e V

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1.02 M e V

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Solution

The correct option is C $25 m e V$
Quantitatively, the thermal energy per particle is about $0.025$ electron volt—an amount of energy that corresponds to a neutron speed of about $2, 000$ metres per second and a neutron wavelength of about $2 \times 10^{- 10}$ metre (or about two angstroms).

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