The initial activity of a certain radioactive isotope was measured as $16000\ counts\ min^{-1}$. Given that the only activity measured was due to this isotope and that its activity after $12\, h$ was $2000\ counts\ min^{-1}$, its half-life, in hours, is nearest to
The initial activity of a certain radioactive isotope was measured as $16000\ counts\ min^{-1}$. Given that the only activity measured was due to this isotope and that its activity after $12\, h$ was $2000\ counts\ min^{-1}$, its half-life, in hours, is nearest to
- A
$9$
- B
$6$
- C
$4$
- D
$3$
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- [AIPMT 2013]
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