Physics, 22.11.2020 07:10, jaumonking

What is the half-life of a radioisotope? half of the time needed for a sample of radioisotope to become stable
the time needed for half of a sample of radioisotope to decay
the time needed before the first half of a radioisotope begins to decay
half of the time needed for a radioisotope to leave the body

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What is the half-life of a radioisotope? half of the time needed for a sample of radioisotope to be...