Exam-style question
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What role do control rods play in a nuclear reactor?.
- A.They increase the speed of neutrons.
- B.They absorb excess neutrons to regulate the fission process.
- C.They provide a source of neutrons for fission.
- D.They cool the reactor core.
Model answer
What a good answer should say
- They absorb excess neutrons to regulate the fission process.
Explanation
Why this works
Control rods are made of materials that absorb neutrons, such as boron or cadmium. By adjusting the position of these rods in the reactor core, operators can control the rate of the fission reaction and maintain a stable output of energy.
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