Which of the following best describes half-life?
a. Half the time it takes for all of the nuclei in a sample of a radioactive isotope to decay.
b. The time it takes for the nucleus of one atom of a radioactive isotope to split in half.
c. The time it takes for half of the nuclei in a sample of a radioactive isotope to decay.
d. The time it takes for the nucleus of one atom of a radioactive isotope to decay.
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