A) correct
B) wrong
C) information is insufficient
D) none of the above
Correct Answer: B
Solution :
Because the neutron has no electric charge, it experiences no electric repulsion from a \[{{\text{U}}^{\text{235}}}\]nucleus. Hence, a slow moving neutron can approach and enter a \[{{\text{U}}^{\text{235}}}\]nucleus, thereby providing the excitation needed to trigger fission. By contrast a slow moving proton feels a strong repulsion from a \[{{\text{U}}^{\text{235}}}\]nucleus. It never gets close to the nucleus, so it cannot trigger fission.
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