The half-life of a radioactive substance is 30 min. The time (in minutes) taken

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

Options

(a) 15
(b) 30
(c) 45
(d) 60

Correct Answer:

60

Explanation:

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