Nuclear engineering (moderation): In a nuclear reactor, graphite rods serve which primary function in the chain reaction? Focus on the role of graphite in neutron energy control. Choose the correct option.
IIT JEE
Chemistry
Difficulty: Easy
Choose an option
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AReact with uranium to release energy
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BProduce neutrons
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CUndergo combustion to trigger fission
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DConvert fast neutrons into thermal neutrons (moderator)
Answer
Correct Answer: Convert fast neutrons into thermal neutrons (moderator)
Explanation
Concept/ApproachGraphite is a moderator. It slows fast neutrons to thermal energies, increasing the probability of fission in certain fuels (e.g., U-235). It neither produces neutrons nor reacts chemically to trigger fission.
Final AnswerConvert fast neutrons into thermal neutrons (moderator)