In which one of the following cases mean free path increases

1.	In which one of the following cases mean free path increases
Answer» Helium MOLECULES in a container are REPLACED by OXYGEN molecules Oxygen molecules in a container replaced by `CO_2` molecules `N_2` molecules in a container are replaced by Helium molecules Helium molecules in a container are replaced by nitrogen molecules Solution :`lambda darr` is size of molecules `uarr`.

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