State the relation between average life and decay constant.

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(N/A) The average life (or mean life),denoted by $\tau$,is defined as the ratio of the total life time of all radioactive nuclei to the total number of nuclei present initially.
Mathematically,the relation between average life $\tau$ and decay constant $\lambda$ is given by:
$\tau = \frac{1}{\lambda}$
where $\lambda$ is the decay constant of the radioactive substance.

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