We took two separate gases with the same number densities for both. If the ratio of the diameter...

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We took two separate gases with the same number densities for both. If the ratio of the diameters of their molecules is \( 4: 1 \), then ratio of their mean free paths is
(a) \( 1: 4 \)
(b) \( 4: 1 \)
(c) \( 2: 1 \)
(d) \( 1: 16 \)
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