Tow gases-argon (atomic radius 0.07 nm, ...

Tow gases-argon (atomic radius `0.07` nm, atomic weight 40) and xenon (atomic radius `0.1` nm, atomic weight 140) have the same number density and are at the same temperature. The ratio of their respective mean free times is closest to :

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Tow gases-argon (atomic radius `0.07` nm, atomic weight 40) and xenon (atomic radius `0.1` nm, atomic weight 140) have the same number density and are at the same temperature. The ratio of their respective mean free times is closest to :

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