Question

Which of the following will not alter the value of mean free path of a given gas?

• A. If at constant temperature volume is increased
• B. If some amount of given gas is added in container keeping volume constant
• C. If some amount of given gas is added in container keeping temperature and pressure constant
• D. If pressure is increased

Answer 1

The correct option is C If some amount of given gas is added in container keeping temperature and pressure constant

The mean free path of a gas can be represent by the formula,
$\lambda =\frac{1}{\sqrt{2}\pi d^2\frac{N}{V}}$
So mean free path $\left(\lambda \right)$ is inversely proportional to particle density of given gas which will not change in (c)