Mean free path decreases if

1.	Mean free path decreases if
Answer» `H_2` is REPLACED by He He is replaced by `H_2` He is replaced by `O_2` `O_2` is replaced by `CO_2` Solution :`LAMBDA alpha 1/(sigma) , sigma_(He) < sigma_(H_2) < sigma_(O_2) < sigma_(CO_2)`.

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