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After a certain laps of time , fraction ...

After a certain laps of time , fraction of radioactive -potonium undecays is found to be 12.5% of the initial quantity. What is the duration of this time lapse if half life of potonum is 139 days ?

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The correct Answer is:
417 days
`N/N_0=(1/2)^n rArr 125/1000 = (1/2)^n rArr n=3, t=nT_(1//2)`
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