A moderator is used in nuclear reactor in order to ?
- A. Accelerate the neutrons
- B. Slow down the speed of the neutrons
- C. Increase the number of elections
- D. Decrease the number of electrons
- E. None of these
Explanation
A moderator reduces the speed of fast neutrons, commonly using materials such as water or graphite. Slow neutrons are more effective at sustaining fission in many nuclear reactors.