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

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a
20 min
b
40 min
c
80 min
d
60 min

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detailed solution

Correct option is B

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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