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The half-life of radon is 3.8 days. Afte...

The half-life of radon is 3.8 days. After how many days `19/20` of the sample will decay ?

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`N=(1-(19)/(20)) N_0 rArr N/(N_0)=1/(20)rArr 1/(20)=(1/2)^n rArr n=(log20)/(log2),t=nxxT_(1//2)`
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