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What is average life?

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What is average life?

    • Posted by Sudiptyo Banik 6 years, 3 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Yogita Ingle 6 years, 3 months ago

    Average life or mean life (τ) of a radioactive element is the ratio of total life time of all the atoms and total number of atoms present initially in the sample.

    Relation between average life and decay constant τ = 1 / λ

    Relation between half-life and average life τ = 1.44 T

    The number of atoms left undecayed after n half-lifes is given by

    N = No (1 / 2)n = No (1 / 2) t/T

    where, n = t / T, here t = total time.

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