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Mean free path decreases if...

Mean free path decreases if 

A

`H_2` is replaced by He

B

He is replaced by `H_2`

C

He is replaced by `O_2`

D

`O_2` is replaced by `CO_2`

Text Solution

Verified by Experts

`lambda alpha 1/(sigma) , sigma_(He) < sigma_(H_2) < sigma_(O_2) < sigma_(CO_2)`.
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