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 decay constant of this sample?

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The Answer of 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 decay constant of this sample?

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

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