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Exit Quiz
Question 1 of 6
1
of 6
Which of the following definitions describing the half–life of a radioactive isotope is correct?
Select one answer
Half the time it takes for one nucleus to decay.
The time it takes for half of all the nuclei to decay.
Half the time it takes for the number of nuclei to fall to zero.
Radon–222 has a half–life of 3.8 days. This means that after 3.8 days, there will be half the number of radon–222 nuclei left in the sample.
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