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Carbon-11 Is Used in Medical Imaging

Question 39

Multiple Choice

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?

A) 40.8%
B) 2.45%
C) 81.7%
D) 0.183%
E) 18.3%

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