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Starter Quiz
Question 1 of 6
1
of 6
Which of the following describes what is meant by a radioactive isotope having a half–life of 15 minutes?
Select one answer
It takes 15 minutes for all of the nuclei to decay.
It takes 15 minutes for one nucleus to decay.
It takes 15 minutes for half of the nuclei to decay.
The half–life of thorium–227 is 19 days. This means that after 19 days, there will be half the number of nuclei in the sample.
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