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.^(131)I has half life period 13.3 hour....

`.^(131)I` has half life period 13.3 hour. After 79.8 hour, what fraction of `.^(131)I` will remain ?

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`N = N_(0) ((1)/(2))^(n)`
`(N)/(N_(0)) = ((1) /(2))^(6) = (1)/(4)`
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