Nuclear Energy; Effects and Uses of Radiation (id: 693ae63fc)

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]
How can a neutron, with pa40z9fn+b tay ract,4wcai 2shm uw5q34i,frf a h5ically no kinetic energy, excite a nucleus to the extent shown in 5im3rf4f4ias 5wh , a chqu,w2(Fig. Below)?

参考答案:
First of all, the neutron can get close to the nucleus at such slow speeds due to the fact that it is neutral and will not be electrically repelled by either the electron cloud or the protons in the nucleus. Then, once it hits a nucleus, it is held due to the strong nuclear force. It adds more energy than just kinetic energy to the nucleus due to E = m$c^2$. This extra amount of mass-energy leaves the nucleus in an excited state. To decay back to a lower energy state, the nucleus will fission.


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