Abstract
Theory tells us that whenever an object speeds through the atmosphere at the velocity of sound, or faster, it generates a compression wave or shock wave that is similar to a high explosive blast wave. The ear perceives a definite boom, and the skin pressure receptors may sense a momentary concussion. Sonic boom is currently the popular term for the phenomenon. Through all of history, hearing beings have occasionally been startled by the explosions of meteorites crashing down through the atmosphere, our earliest example of the sonic boom. More familiar examples are the sharp crack of a passing rifle bullet and even the explosive pop of the lion trainer's whip as it accelerates for an instant beyond the speed of sound. The foundation of our present supersonic jet era embraces a fascinating story of concentrated aeronautic research and development effort and heroic test flights in an international race to achieve
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