Question

The fission of$U-235$ takes places effectively only if the bombarding neutrons are very fast.

• A. True
• B. False

Answer 1

The correct option is B False

1. When a $U-235$ nucleus absorbs a slow moving neutron, it splits into two parts which is called as a nuclear fission.
2. Each time when it splits it releases $2$ or $3$ neutrons, therefore, the fission reactions continues and it is called a chain reaction.
3. The probability of capturing a slow moving neutron is more compared to fast moving neutron.
4. Therefore, a slow moving neutrons works effectively with $U-235$ in a nuclear reactor.

Hence, the given statement is False.