Sound usually travels at a speed of ( about 760 ) miles an hour at sea level. As a object moves through the air there are sound waves passing in front of it. ( sound waves are all around us ) This does not create a problem until the object is moving as fast as they are. When this happens the object pushes the sound waves against each other creating a wall of sound waves. As the moving object reaches a speed that is faster then the sound waves, it has to break through. when it does that's the cracking sound. A ( a explosion )When you shoot a shotgun or sub sonic ammunition you hear a bang but not the cracking sound.And the sound that comes from the end of a whip. Yes, that to.
Email Us