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Half-life is the time required for an attenuating quantity to reduce to half of its initial value. It is proportional to the mean lifetime, whose inverse is the decay constant. It is a constant for exponential decay.

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Why mean life of radioactive element is slightly greater than halflife..? [duplicate]

I was reading radioactivity where I find that half life of a radioactive material is less than mean life due the presence of $\log2$ in the numerator: $$ t_{1/2} = \frac{0.693}{\lambda} $$ But how wha …
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