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Define the average time period of a radi...

Define the average time period of a radio active element.

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The average time period of a radio active element is defined as the ratio of sum of lives of all the atoms to the total number of atoms present in the radio active sample.
i.e., `tau=(1)/(N_(0))[- underset (N=N_(0)) overset (N=0) int tdN]`
i.e., `tau=(1)/(lambda)`
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