If it takes 25 years for a radioactive element to decay to 25% of its initial mass,then its half-life is 12.5 years.

Name: If it takes 25 years for a radioactive element to decay to 25% of its initial mass,then its half-life is 12.5 years.
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Quizplus · Accepted Answer

The definition of half-life is the amount of time it takes for half of the initial mass to decay. Since it takes 25 years for the mass to decay to 25%, it means half of the initial mass decayed in 12.5 years, which is the half-life.

If It Takes 25 Years for a Radioactive Element to Decay