A radioactive substance decays at the rate of \( \mathrm{P} \) 5000...

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A radioactive substance decays at the rate of
\( \mathrm{P} \) 5000 disintegration per minute. After 5 minutes it disintegrates at 1250 disintegration per minute.
W The decay constant is \( n \ln 2 \mathrm{~min}^{-1} \). Then the value of \( n \) is
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