Question

half life time for radio active law

Answer 1

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Half-life (symbol t1⁄2) is the time required for a quantity to reduce to half its initial value. The term is commonly used in nuclear physics to describe how quickly unstable atoms undergo, or how long stable atoms survive, radioactive decay.
The only thing which can alter the half-life is direct nuclear interaction with a particle from outside, e.g., a high energy collision in an accelerator. The predictions of decay can be stated in terms of the half-life , the decay constant, or the average lifetime.

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