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Iiodine -131 is a radioactive isdotpe. I...

Iiodine -131 is a radioactive isdotpe. If 1.0 mg of `""^(131)I` has an activity of `4.6xx10""^(12)`Bq. What is the half-life of `""^(131)I` (in days)

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The correct Answer is:
8
`(dN).(dt)=lamdaN`
`4.6xx10""^(12)=lamdaxx(1xx10""^(-3))/(131)xx6.023xx10""^(23)`
`t""_(1//2)=0.693//lamda`
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