Question
The half-life of 131 $\mathrm{I}$ is 8.04 days. On a certain day, the activity of an iodine-131 sample is 6.40 $\mathrm{mCi}$ . What is its activity 40.2 days later?
Step 1
This can be represented by the equation: \[ A = A_0 e^{-\lambda t} \] where \(A\) is the activity at time \(t\), \(A_0\) is the initial activity, \(\lambda\) is the decay constant, and \(t\) is the time elapsed. Show more…
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