Graphite is used in nuclear reactor as_____________________?
Correct answer: B. Retarder of neutron velocity
- A. Insulation lining of the reactor
- B. Retarder of neutron velocity
- C. Lubricant
- D. Fuel
Explanation
Graphite slows fast neutrons through repeated elastic collisions without strongly absorbing them, improving the chance of fission in fuels such as U-235. It therefore acts as a neutron moderator or retarder.
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