The velocity of thermal (slow) neutrons triggering nuclear fission reaction (having energy equal to 0.025 eV) is about ______________ metres/second?
Correct answer: B. 2200
- A. 1100
- B. 2200
- C. 3300
- D. 4400
Explanation
For a neutron with energy 0.025 eV, the relation E = ½mv² gives a speed of approximately 2.2 × 10³ m/s. This is why 2200 m/s is used as the standard velocity of thermal neutrons.
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