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A radioactive sample contains `1.00xx10^15` atoms and has an activity of `6.00xx10^11` Bq. What is its half-life?

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A radioactive sample contains `1.00xx10^15` atoms and has an activity of `6.00xx10^11` Bq. What is its half-life?
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`R=lambdaN`
`6xx10^11=1.0xx10^15 lambda`
`:.` `lambda=6xx10^-4s` `t_(1//2)=(1n2)/(lambda)=(0.693)/(6xx10^-4)s`
`=1155s=19.25` min
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