Nuclear & Quantum Physics E.3 Radioactive Decay (id: 7ca01a22d)

本题目来源于试卷: Nuclear & Quantum Physics E.3 Radioactive Decay，类别为 IB物理学

[问答题]
The graph shows the variation of the mean2 oan0v.ps: psured activity of an isotope sama7hi7j-+h b-mhb)bj f ple with timb jh)--h bbm 77ahfi+je.

1.State what is meant by activity.
2.Explain why the activity graph doesn’t approach zero as time increases.
3.The activity graph is corrected so as to reach zero as time increases as shown below.

(1)Determine the half-life of the sample.
(2)The initial mass of this sample was 248 g. Determine the time that would elapse before 31 g of the sample remained.

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