The half-life of a radioactive substance is 30 min . The time (in minutes) taken between 40 % decay and 85 % decay of the same radioactive substance is

Question

The half-life of a radioactive substance is 30 min . The time (in minutes) taken between 40 % decay and 85 % decay of the same radioactive substance is, 15, 30, 45, 60

MARKS App · Accepted Answer

Number of active nuclei falls from 60% to 15% So the sample becomes 1 4 t h = 1 2 2 t h So the number of half-lives = 2 Time t = 2 × 30 = 60 min

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