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

question 15

Multiple Choice

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,at an air speed of 1.1 m/s.How long must your pipeline be for the sample to decay to 3% of its original activity?

• A)678 m
• B)8 m
• C)7 m
• D)2 m

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