Home Physics Kinematics Motion in a Straight Line The mean free path of molecules of a certain…
Physics Kinematics Motion in a Straight Line Single Correct MCQ
Published on: September 12, 2026

The mean free path of molecules of a certain gas at STP is 1500d, where d is the diameter of the gas molecules. While maintaining the standard pressure, the mean free path of the molecules at 373 K is approximately:

A
750d
B
1098d
C
2049d
D
1500d

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The correct answer is:
C

The mean tree path is given by the relation,

So, A T

Let ' be the new mean free path.

Hence,

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