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The mean free path for gas with molecula...

The mean free path for gas with molecular diameter d and number density n can be expressed as:

A

`1/(sqrt(2) n pi d)`

B

`1/(sqrt(2) n pi d^2)`

C

`1/(sqrt(2) n^2 pi d^2)`

D

`1/(sqrt(2) n^2 pi^2 d^2)`

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