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Two gases Ar (40) and Xe (131) at same temperature have same number density. Their diameters are `0.07 nm` and `0.10 nm` respectively. Find the ratio

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Two gases Ar (40) and Xe (131) at same temperature have same number density. Their diameters are `0.07 nm` and `0.10 nm` respectively. Find the ratio of their mean free time
A. 1.03
B. 2.04
C. 3.04
D. 2.4
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Correct Answer - B
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