question_answer

Which of the following nuclei undergo fission when struck by thermal neutrons?

1. \[{{\text{U}}^{\text{235}}}\]

2. \[{{\text{U}}^{\text{238}}}\]

3. \[{{\text{U}}^{\text{239}}}\]

Select the correct answer using the code given below

A)  1 and 2           

B)  2 and 3

C)  1 and 3           

D)  1, 2 and 3