An opaque cone on its side, with the plane as a projectile emerging from the apex. The phenomenon is a shock wave. It was first predicted and described by Austrian physicist Ernst Mach (1838-1916).
An aircraft flying at 40,000 feet can be heard to break the sound barrier when it achieves a speed of how many miles per hour?
What is the name of the process by which a wave motion such as light or sound is turned back on reaching a boundary between two media?
