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

Two 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 :

A

1.03

B

2.04

C

3.04

D

2.4

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The correct Answer is:
B
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