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If a substance with half life 3 days is taken at other place in 12 days . What amount of substance is left now

Answer»

`1//4`
`1//8`
`1//16`
`1//32`

Solution :T = `t_(1//2) xx N` i.e. 12 = `3 xx n implies n = 4`
`N = N_(0) ((1)/(2)) ^(n) implies (N)/(N_(0)) = ((1)/(2))^(4) = (1)/(16)`.


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