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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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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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The half life period of a radioactive element X is same as the mean life time of another radioactive element Y. Initially both of them have the same number of atoms. Then
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