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Vanshika

· started a discussion

· 1 Months ago

How?? (Question:273885.0)

I want to ask for the detailed answer

Question:

If the pressure in a closed vessel is reduced by drawing out some gas, the mean free path of the molecules —

Options:
A)

is decreased

B)

is increased

C)

remains unchanged

D)

increased or decreased according to the nature of the gas.

Solution:

Ans: (b) If the pressure in a closed vessel is reduced by drawing out some gas, the mean free path of the molecules is increased

Knowledge Expert

· commented

· 1 Months ago

The mean free path or average distance between collisions for a gas molecule may be estimated from kinetic theory. Serway's approach is a good visualization - if the molecules have diameter d, then the effective cross-section for collision can be modeled by


using a circle of diameter 2d to represent a molecule's effective collision area while treating the "target" molecules as point masses. In time t, the circle would sweep out the volume shown and the number of collisions can be estimated from the number of gas molecules that were in that volume.

Lokendra Singh

· commented

· 1 Months ago

give explanation of this question ? tr team
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