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At any given time a piece of radioactiv...

At any given time a piece of radioactive material `(t_(1//2)=30` days) contains `10^(12)` atoms. Calculate the activity of the sample in dps.

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The correct Answer is:
`2.67 xx 10^(5) dps`
`A=N lambda rArr 10^(12) xx(ln2)/(30 xx24xx60xx60)=2.67xx10^(5)` d.p.s.
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