Question

State True or False.

The mean free path of a molecule depends upon the number of molecules per unit volume and the cross section of the molecule.

• A. True
• B. False

Answer 1

The correct option is A True

In kinetic theory the mean free path of a particle, such as a molecule, is the average distance the particle travels between collisions with other moving particles.
The magnitude of the mean free path depends on the characteristics of the system. An expression for the MFP is
$\ell =(\sigma n{)}^{-1}$ Where is the mean free path, n is the number of target particles per unit volume, and is the effective cross sectional area for collision.

Thus the given statement is true.