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A radioactive material of half-life T wa...

A radioactive material of half-life `T` was kept in a nuclear reactor at two different instants. The quantity kept second time was twice of the kept first time. If now their present activities are `A_1` and `A_2` respectively, then their age difference equals

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The correct Answer is:
`T/(ln2) ln((A_2)/(2A_1))`
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