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A certain substance decays to 1//32 of i...

A certain substance decays to `1//32` of its initial activity in `25` days. Calculate its half-life.

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`1goverset(1)rarr(1)/(2)goverset(2)rarr(1)/(4)goverset(3)rarr(1)/(8)g overset(4)rarr(1)/(16)g`
`overset(5)rarr(1)/(32)g :. n=5`
`(n) =(t)/(t_(1//2))rArrt_(1//2)=(t)/(n)=(25)/(5) , t_(1//2)=5 "days"`
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