what is


Question by  sumaya1 (97)

What is a half life?


Answer by  ShanL (684)

This term refers to the amount of time it takes a substance to decay to the point where only half of it is left (so it has decreased by 50%).


Answer by  palaeologus (564)

The period of time that must elapse before precisely half of a quantity of a radioactive element (such as uranium) decays, thereby becoming either another element or another isotope of the same element.

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