Question
For fission of uranium $$_{92}^{235}U,$$ one needs
A.
very fast neutrons (a few electrons volts)
B.
low energy neutrons $$\left( { \approx 0.04\,eV\,{\text{at}}\,300K} \right)$$
C.
a moderator making neutrons slow
D.
both (B) and (C)
Answer :
both (B) and (C)
Solution :
Fission of $$_{92}^{235}U$$ is possible by only slow neutrons. To produce slow neutrons, one has to use moderators so that fission is
possible.