Question

The expression for mean free path is :

• A. $\lambda =\frac{KT}{\sqrt{2}\pi d^{2}P}$
• B. $\lambda =\frac{\pi dP}{kT}$
• C. $\lambda =\frac{\pi d^{2}P}{kT}$
• D. $\lambda =\frac{kT}{\pi dP}$

Answer 1

The correct option is A $\lambda =\frac{KT}{\sqrt{2}\pi d^{2}P}$

The formula for mean free path is given by

$\lambda =\frac{KT}{\sqrt{2}\pi d^{2}P}$

where K=Boltzmann's constant

$T$= temperature( in kelvin )

$d$= The diameter of the gas particles

$P$= pressure