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The Decay Rate of a Radioactive Sample Decreases From 175kBq175 \mathrm { kBq }

Question 92

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The decay rate of a radioactive sample decreases from 175kBq175 \mathrm { kBq } to 12.4kBq12.4 \mathrm { kBq } in 18.3 s18.3 \mathrm {~s} . What is the mean life (time constant) of this sample?

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