Propagation of Spherical Waves from a Moving Source

Shock Waves

Compare the propagation of sound wavefront when the speed of the source exceeds the speed of sound to the case where the speed of the source is less than the speed of sound. The dense cone that forms behind the wave when the source is moving faster than the speed of sound is known as a shock wave.

Doppler Effect

Examine the space between the wavefronts at the leading edge and trailing edge of the pattern when the speed of the source is less than the speed of sound.