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A sample of .^(14)CO(2) was to be mixed ...

A sample of `.^(14)CO_(2)` was to be mixed with ordinary `CO_(2)` for a biological tracer experiment . In order that `10 cm^(3)` of diluted gas should have `10^(4) "dis"//"min"`, what activity (in `muCi`) of radioactive carbon is needed to prepare 60L of diluted gas at STP. [`1Ci=3.7 xx10^(10)dps`]

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The correct Answer is:
B
A=`lambda`N,activity (or rate of decay)of 10 ml gas `rArr (10)^(4)/(60)`dps
rate of decay of 60 litre gas`=((10^(4))/(60))xx(60xx1000)/(10)=10^(6)` sec
`( :.1Ci=3.7xx10^(10dps)). " "=(10)^(6)/(3.7xx10^(10))=27xx10^(-6)Ci=27 mu Ci`
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