Half – life of a radioactive substance is 20min. The time between 20% and 80% decay will be

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20 min

40 min

80 min

60 min

answer is B.

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Detailed Solution

20 % decay, present 80%80 % decay, present 20%80 % to 20 % becomes ¼ i.e., two half life timei.e., 2 x 20 = 40 mins

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