Question

(ii) On Fig. 2.1 , draw dotted lines to represent three different rare- factions.
(iii) state, in terms of both molecules and pressure, what is meant by a rare faction.​

Answer 1

Given:

The wavefronts of a pressure wave has been provided in the attached diagram.

To find:

• Representation of compressions in the diagram

• Meaning of rarefaction in terms of molecules and pressure.

Calculation:

Please refer to the attached diagram to understand the compressions present within the wave fronts of the pressure wave.

$\boxed{ \red{ \large{\bold{ \underline{Rarefaction}}}}}$

• In a pressure wave the particles of the medium vibrate parallel to the direction of the propagation of the waves.

• During these vibrations, the particles of the medium periodically come close to one another

• This part of the wave is called the Compressions.

• Again, the particles go away from each other. That part of the longitudinal wave where the density is least is known as rarefactions.

• In terms of pressure , rarefaction part of a longitudinal wave having the least pressure where as compressions have the maximum pressure due to accumulation of particles in a small space.