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The initial activity of a certain radioa...

The initial activity of a certain radioactive iostope was measured as `16000` counts `min.^(-1)`. Given that the only activity measured was due to this isotaope and that its activity after `12 h` was `2100` counts `min.^(-1)`, its half-life, in hours, is nearest to [Given `log_(e) (7.2)=2`].

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