Question

In which case, mean free path is not affected?

• A. $H_2$ gas at ${100}^{\circ }C$ and $1atm$ is transferred into a vessel at ${50}^{\circ }C$ and $.05atm$
• B. $O_2$ gas at $200K$ and $2atm$ is transferred into a vessel at $400K$ and $1atm$
• C. $O_2$ gas is replaced by $H_2$ gas keeping other variables constant
• D. Medium is made more viscous

Answer 1

The correct option is A

$H_2$ gas at ${100}^{\circ }C$ and $1atm$ is transferred into a vessel at ${50}^{\circ }C$ and $.05atm$

$\lambda$ (mean free path) $\propto$ $\frac{T}{P}$

$\frac{T}{P}$ ratio does not change for hydrogen at 100 degree celsius and 1 atm pressure when transferref into a vessel at 50 degree celsius and 0.5 atm pressure.