1.

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"mu Ci) of radioactive carbon is needed to prepare 60L of diluted gas at 1 atm and 273 K? [1 Ci=3.7 xx10^(10) "dps"]

Answer»

`270mu CI`
`27muCi`
`2.7 MUCI`
`2700 muCi`

ANSWER :B


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