A radioactive sample emits \( \mathrm{n} \beta \)-particles in \( 2...

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A radioactive sample emits \( \mathrm{n} \beta \)-particles in \( 2 \mathrm{sec} \). In next \( 2 \mathrm{sec} \) it emits \( 0.75 \mathrm{n} \beta \)-particles, what is the mean life of the sample?
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