If `P` is doubled and `T` is reduced to half at constant volume, what will be its effect on the mean free path (`lambda`) of a gas molecule?

Options

A. `lambda` will decrease
B. `lambda` will increase
C. no effect on `lambda`
D. Cannot predict

Explanation

At constant `V`, `lambda` does not change if `T` or `P` changes.
`lambda prop (T)/(P)` and `P prop T` (at constant `V`)(Charles's law)
`:. Lambda prop` constant