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The t(0.5) of a radioactive element is r...

The `t_(0.5)` of a radioactive element is related to its average life by the expression

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The half-life of a radioactive element is defined as the average time interval during which half of the initial number of nuclei of the element disintegrate
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The half life period of a radioactive element x is same as the mean life time of another radioactive element y. Initially they have the same number of atoms.Then :