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CRS Question, 5–25
QUESTION
Radon (element 86) is a radioactive noble gas that can be found in some homes.  In those situations radon can diffuse in the air and end up inhaled by the occupants.  What is the ratio of the velocity of radon gas compared with O2 in the same room at the same conditions?
1. 2.6 times faster
2. 0.38 times as fast
3. 0.14 times as fast
4. 6.9 times faster