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

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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?


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