A) very fast neutrons (a few electrons volts)
B) low energy neutrons (\[\approx \]0.04 eV at 300K)
C) a moderator making neutrons slow
D) both and
Correct Answer: D
Solution :
[d] 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.
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