A bullet bow shockwave is a physical and audible wave created in the air when a bullet travels at supersonic speeds; meaning faster than the speed of sound. The speed of sound c (from Latin celeritas, velocity) varies depending on the medium through which the sound waves pass. ...

The bullet bow shockwave is the result of air being greatly compressed at the front-most tip of the bullet as it slices through the air. As the bullet moves forward a broadening wave of compressed air trails out diagonally from the bullet tip. The sides of the bullet create a conical waveform. This conical waveform may be audible to a witness as a whip-crack sound. A cone is a basic geometrical shape: see cone (geometry). ... Waveform quite literally means the shape and form of a signal, such as a wave moving across the surface of water, or the vibration of a plucked string. ... This article is about witnesses in law courts. ... A whip is a cord or strap, usually with a stiff handle, used for delivering blows to human beings or animals as a means of control or punishment or torture. ...

A bullet bow shockwave will be heard by any witness as long as the bullet speed is faster than the speed of sound, whether the bullet was fired from a weapon giving off an openly audible muzzle blast, or a mechanically-suppress-fired muzzle (silenced weapon) blast. If a bullet is fired from a silenced weapon, a witness can mistake the bullet bow audible shockwave whip-crack for the weapon muzzle blast audible wave, which is a separate, slightly preceding, audible event. It might be noted here that if one incures such an event, that the sound you hear from a silenced weapon will not be from the point of origin. This crack sound will most likely be 180 degrees opposite from its origin. The sound will come from the point that the bullet ceases to be faster than the speed of sound. The word silencer can mean:- A noise-suppressor on the end of a guns barrel. ...