Nuclear Physics and Radioactivity (id: 5b700e6e5)

本题目来源于试卷: Nuclear Physics and Radioactivity，类别为 IB物理学

[问答题]
Which radioactive isotope of lead is beinfbe+ 48jvnhke8p+;hvctkp)/ ,/n ft2gf: e pgizl * a a/f(vif+/ziw+g produced in a reaction where the measured activity of a sample drops to 1.05/ izlf(+z wa+avii/f*0% of its original activity in 4.00 h?

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