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A sonic boom is the sound produced when an object breaks the sound barrier i.e when it travels faster than the speed of sound. When a body travels below the speed of sound (subsonic), the sound emitted by it travels in all directions.
The boom was produced by a F-4 flying just above the speed of sound at an altitude of 100 feet. In recent tests, the maximum boom measured during more realistic flight conditions was 21 pounds per square foot. There is a probability that some damage -- shattered glass, for example, will result from a sonic boom.