The half-life of 222Rn is 3.82 days. (a) Convert the half-life to seconds. s(b) Calculate the decay constant for this isotope. s−1(c) Convert 0.620 μCi to the SI unit the becquerel. Bq(d) Find the number of 222Rn nuclei necessary to produce a sample with an activity of 0.620 μCi. 222Rn nuclei(e) Suppose the activity of a certain 222Rn sample is 7.20 mCi at a given time. Find the number of half-lives the sample goes through in 40.2 d and the activity at the end of that period. (Enter your answer for the number of half-lives to at least one decimal place.)   half-lives   mCi

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Nuclear Reactions

Nuclear reactions are processes in which the fundamental characteristics of a nucleus changes. They change into a completely different nucleus. These processes occur naturally in an unstable nucleus. Bombarding an energetic particle can induce nuclear reactions.  In this article, both the naturally occurring nuclear reactions are termed as radioactive decay and the induced nuclear reactions are further categorized as nuclear fission and nuclear fusion.