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An Air Sample Is Contaminated with 15O,which Has a Half-Life

Question 60

Multiple Choice

An air sample is contaminated with 15O,which has a half-life of 2.03 min.One possible way to minimize its hazard is to pass it through a long pipe to allow it to decay inside the pipe until it can be safely released into the atmosphere.If the oxygen moves at a speed of 1.1 m/s in the pipe,how long must the pipe be for the sample to have decayed to 3.0% of its original activity just as it leaves the pipe?


A) 680 m
B) 8.0 m
C) 7.0 m
D) 2.0 m

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