Radioactive Decay: An air sample is contaminated with 15O, which has a half-life of 2.03 minutes. You can pass it through a long pipe to allow it to decay until it can be safely released into the atmosphere. If the speed of the gas in the pipe is 1.1 m/s, how long must the pipeline be for the sample to decay to 3.0% of its original activity?
A. 680 m
B. 8.0 m
C. 72 m
D. 250 m
Answer: A
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