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.