Half-life of a substance is 10 years. In what time, it becomes \[\frac – McqOptions

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1.	Half-life of a substance is 10 years. In what time, it becomes \[\frac{1}{4}\]th part of the initial amount [AIEEE 2002]
A.	5 years
B.	10 years
C.	20 years
D.	None of these
Answer» D. None of these

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