1.

After 2 hours, a radioactive substance becomes ((1)/(16))^(th) of original amount. Then the half life (in min) is

Answer»

60 minutes
120 minutes
30 minutes
15 minutes

Solution :`t OVERSET(1//2) to (1/2) overset(t_(1//2)) to (1/4) overset(t_(1//2)) to (1/8) overset(t_(1//2)) to (1/16)`
`THEREFORE 4 t^(1//2) = 2` HOURS `rArr t^(1//2) = 30` min.


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