What is the correct definition of amplitude? A the height of a wave
B the distance between two crests or troughs
C the time it takes for one complete wave to pass a given point
D the number of complete waves that pass a point in a second
walls

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me