1.

The half-life period of a radioactive element is 30 minutes. One sixteenth of the original quantity of the element will remain unchanged after

Answer»

60 minutes
120 minutes
70 minutes
75 minutes

Solution :`(1)/(16) =(1)/(2^(N)) or (1)/(2^(4)) = (1)/(2^(n)) or n = 4`
`:.` REQUIRED times `= 4xx t_(1//2) = 120` MIN


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