本题目来源于试卷: Nuclear Physics and Radioactivity，类别为 IB物理学
[问答题]
Immediately after a u. 1+ hgwcxx0b;/ oe/0aobxa y$_{92}^{238}\text{U}$ nucleus decays to $_{90}^{234}\text{Th} + _{2}^{4}\text{He}$, the daughter thorium nucleus still has 92 electrons circling it. Since thorium normally holds only 90 electrons, what do you suppose happens to the two extra ones?
参考答案:
The two “extra” electrons are no longer bound tightly to the nucleus (since the nucleus lost two positively charged protons), and so those extra electrons can move away from the nucleus, moving towards a higher electric potential or some other positively charged object. They are not “emitted” during the decay, since they do not receive any of the kinetic energy from the decay. If they are close to each other, they would repel each other somewhat.
本题详细解析:
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