GK
NUCLEAR SCIENCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The function of moderators in nuclear reactor is to
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control the chain reaction.
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absorb the secondary neutrons.
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slow down the secondary neutrons.
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none of these.
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Explanation:
Detailed explanation-1: -A moderator is used to slow down the high energy neutrons upto the thermal neutrons, having energy 0. 025 eV, emitted in the chain reaction of U235 fission. Generally, graphite is used as moderator in nuclear power plants.
Detailed explanation-2: -In a nuclear reactor, moderators slow down the neutrons which come out in a fission process. The moderator used have light nuclei. Heavy nuclei will not serve the purpose because. substances with heavy nuclei do not occur in liquid or gaseous state at room temperature.
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