(1) This object at rest is emitting a wave that travels outward in all directions at a constant speed.
(2) This next object is moving to the right creating a bow doppler shift wave where the frequency in front is greater than the frequency behind.
(3) This object traveling at the speed of sound or Mach 1 creates a cone shockwave.
(4) Here is a shadowgraph of a scale model rocket doing a pitch maneuver at Mach Speed (courtessy NASA).
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