Question
A sample of radioactive ${ }_{83}^{214} \mathrm{Bi}$, which has a half-life of $19.9$ min, has an activity of $0.058 \mathrm{Ci}$. What is its activity $1.0$ h later?
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First, we need to determine how many half-lives have passed in 1 hour (60 minutes). Show more…
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