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The half-life of a radioactive element i...

The half-life of a radioactive element is 100 minutes . The time interval between the stages 50% and 87.5 % decay will be `x xx 40` min . The value of x is _____

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The correct Answer is:
5
`100 overset(100)(to) 50 overset(100)(to) 25 overset(100)(to) 12.5 , t = 2 xx 100 = 200` mm
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