1.

Which one of the following statements about uranium is correct                                               [UPSEAT 2002]

A.            \[^{235}U\] is fissionable by thermal neutrons
B.            Fast neutrons trigger the fission process in \[n=1\text{ to }n=2\]
C.            \[^{238}U\] breaks up into fragments when bombarded by slow neutrons
D.            \[n=2\text{ to} n=1\] is an unstable isotope and undergoes spontaneous fission
Answer» B.            Fast neutrons trigger the fission process in \[n=1\text{ to }n=2\]


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