2-1 Sound waves

Planar waves are waves with planar wavefronts

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A ray is a directed line perpendicular to the wavefronts and indicates the direction of
travel of the wavefronts.

A **point source** emits sound waves equally in all directions.

Definitions

A wavefront is an imaginary surface over which the displacements of
particles are the same.

The wavefronts of **Spherical waves** are spheres.

Away from the point source, we can approximate the wavefronts as planes.