Question

Which of the following nuclei undergo fission when struck by thermal neutrons.
1. $U^{235}$
2. $U^{238}$
3. $P{u}^{239}$
Select the correct answer using the codes given below.

• A. 1 and 2
• B. 2 and 3
• C. 1 and 3
• D. 1, 2 and 3

Answer 1

Answer: (C)

1 and 3

Although $U^{238}$ is very abundant as compared to $U^{235}$. But $U^{238}$ do not under go fission when struck by thermal neutrons. Only $U^{235}$ and $P{u}^{239}$ do which releases a huge amount of energy which is further used to generate electricity.