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The half life period of Radium is 3 minute. Its mean life time is
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$\frac{3}{0.6931}$ minute
Mean life time $\tau=1.44 \mathrm{~T}$ where $\mathrm{T}$ is half life period of an atom
$\therefore \tau=1.44 \mathrm{~T}=\frac{\mathrm{T}}{0.6931}=\frac{3}{0.6931}$ minute
$\therefore \tau=1.44 \mathrm{~T}=\frac{\mathrm{T}}{0.6931}=\frac{3}{0.6931}$ minute
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