The half life of radon is 3,8 days . Aft...

The half life of radon is 3,8 days . After how many hdays `(19)/(20)` of the sample will decay ?

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The correct Answer is:

16.4 days

`N=(1-19/20)N_0rArr N/N_0=1/20rArr 1/20=(1/2)^n rArr n="log20"/"log2", t=nxxT_(1//2)`

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