Radioactivity (id: fce42b27e)

本题目来源于试卷: Radioactivity，类别为 美国物理杯赛(Physics Bowl)

[单选题]
04.17: A nucleus of dvln-6 i2d-f v qr1ylkkz8u5z:ew(+ c$_{92}^{235}U$ disintegrates to $_{82}^{207}Pb$ in about a billion years by emitting 7 alpha articles and x beta particles, where x is

A. 3
B. 4
C. 5
D. 6
E. 7


参考答案:  B


本题详细解析: 暂无

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