Definition:
the average time needed for half the nuclei in a sample of a radioactive substance to undergo radioactive decay (the half-life of a substance does not equal half of its full duration of radioactivity)
NC Educators: please take a moment to share your needs and perspectives with us by completing the North Carolina Educator Information Survey
the average time needed for half the nuclei in a sample of a radioactive substance to undergo radioactive decay (the half-life of a substance does not equal half of its full duration of radioactivity)