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

question 92

Short Answer

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

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