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  4. The decay constant of a radioactive element is 1.5 × 10-9 per second. Its mean life in seconds will be:

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Q. The decay constant of a radioactive element is $1.5 \times 10^{-9}$ per second. Its mean life in seconds will be:

Nuclei

Solution:

Mean life $=\frac{1}{\lambda}$
$=\frac{1}{1.5 \times 10^{-9}}$
$=6.67 \times 10^{8} sec$