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Question

The energy of thermal neutron is about :
  1. 25 MeV
  2. 0.51 MeV
  3. 25 meV
  4. 1.02 MeV

A
25 MeV
B
1.02 MeV
C
0.51 MeV
D
25 meV
Solution
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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 2×1010 metre (or about two angstroms).

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