本题目来源于试卷: Nuclear Energy; Effects and Uses of Radiation，类别为 IB物理学
[问答题]
Why must the fission 4 suep7qq*;:d gq (zdtprocess rele(ki7xptm al.zvuej6 *s5u4 i ;ase neutrons if it is to be useful?
参考答案:
To get nuclei to fission, they must be bombarded by neutrons. This can be done using an external source, but then there is a large input of energy into the system, making it less efficient and so less useful. To make the fission reaction useful, it needs to be self-sustaining. To create such a chain reaction, each time a nuclei captures a neutron and fissions, one or more neutrons must be emitted in order to sustain the process.
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