half-life ( synonym found)
Definition of half-life:

°The time required for half of the nuclei in a sample of a specific isotope to undergo radioactive decay.
°In a chemical reaction, the time required for the concentration of a reactant to fall from a chosen value to half that value.
Definition of half-life:

°The time required for half of the nuclei in a sample of a specific isotope to undergo radioactive decay.
°In a chemical reaction, the time required for the concentration of a reactant to fall from a chosen value to half that value.
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