Carbon-11 is used in medical imaging. The half-life of this radioisotope is 20.4 min. What percentage of a sample remains after 50.0 min?

Name: Carbon-11 is used in medical imaging. The half-life of this radioisotope is 20.4 min. What percentage of a sample remains after 50.0 min?
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Quizplus · Accepted Answer

The half-life of Carbon-11 is 20.4 minutes. After 50 minutes, approximately 2.45 half-lives have passed (50/20.4). The remaining percentage of the sample is calculated as (1/2)^(50/20.4) ≈ 0.183 or 18.3%.

Carbon-11 Is Used in Medical Imaging