If originally there were X atoms of radioactive isotope present and now there are only X/2 atoms, how many half-lives have elapsed?

Name: If originally there were X atoms of radioactive isotope present and now there are only X/2 atoms, how many half-lives have elapsed?
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Question

Quizplus · Accepted Answer

One half-life has elapsed because the definition of a half-life is the time it takes for half of the radioactive isotopes to decay, and in this scenario, the quantity has halved from X to X/2.

If Originally There Were X Atoms of Radioactive Isotope Present