In a nuclear power station, moderator is used to,
- A. absorb neutrons
- B. reduce the speed of neutrons
- C. accelerate the speed of neutrons
- D. stop chain reactions
Answer: B. reduce the speed of neutrons
Explanation: A moderator (such as heavy water, light water, or graphite) is used in a nuclear reactor to slow down fast neutrons from fission to thermal velocities suitable for sustaining the chain reaction.