Which of the following is used in a nuclear reactor to slow down fast-moving neutrons?
Carbondioxide gas
Liquid sodium metal
Concrete shield
Graphite rods
Boron rods
Explanation
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Pls the answer is graphites
The slow down the neutrons
While boron regulates the chain reaction by absorbing the neutrons
Answer: Graphite rod
Neutron moderators are a type of material in a nuclear reactor that work to slow down the fast neutrons (produced by splitting atoms in fissile compounds like uranium-235), to make them more effective in the fission chain reaction.
From the below image, we see that Graphite is an example of Neutron Moderator
The answer is Graphite rod because it seerves as a moderator to slow down those fast-moving nuetrons while boron serves as a control rod that absorbs neutrons and regulate reaction
The correct answer is:
D. Graphite rods
Explanation:
In a nuclear reactor, fast-moving neutrons must be slowed down to increase the chances of fission reactions with nuclear fuel (like uranium-235). This is done using a moderator.
Moderators are materials that slow down neutrons without absorbing them. Common moderators include:
• Graphite rods (carbon)
• Heavy water
• Light water
What the other options do:
• A. Carbon dioxide gas – sometimes used as a coolant, not a moderator
• B. Liquid sodium metal – used as a coolant in fast breeder reactors
• C. Concrete shield – used for radiation shielding, not neutron moderation
• E. Boron rods – used as control rods to absorb neutrons and control the rate of the reaction
Final Answer:
D. Graphite rods
