Solve this:
Q. The half-life of a radioactive substance is 30 minutes. The time (in minutes) taken between 40 % decay and 85 % decay of the same radioactive substance is
(1) 15
(2) 30
(3) 45
(4) 60
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https://www.meritnation.com/ask-answer/question/the-half-life-of-a-radioactive-substance-is-20-minutes-t/structure-of-atom/8457559
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refer to the link below for the answer to a similar query,
https://www.meritnation.com/ask-answer/question/the-half-life-of-a-radioactive-substance-is-20-minutes-t/structure-of-atom/8457559
Regards