# Mean Free Path of Electrons in Phonon Calculation

A phonon is an aggregate excitation in periodic, versatile plan of particles in dense matter. It plays a major role in many of the physical properties of condensed matter, like thermal conductivity and electrical conductivity. Enter the values of volume, thermal conductivity, lattice heat capacity and effective sound speed in the mean free path of electrons in phonon calculator to determine the phonon's MPF(mean free path).

### Example:

Calculate the mean free path of electrons in phonon with the volume of 20mm^{3}, thermal conductivity of 5 W/mK, lattice heat capacity of 6 and effective sound speed of 6 m/s?

#### Solution:

l = 3 × 20 × 5 / 6 × 6

= 8.333 .