Half-life of a radioactive substance is 20 minutes. Difference between – McqOptions

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1.	Half-life of a radioactive substance is 20 minutes. Difference between points of time when it is 33% disintegrated and 67% disintegrated is approximately [AIIMS 2000]
A.	10 min
B.	20 min
C.	30 min
D.	40 min
Answer» C. 30 min

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