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The first sonic boom is created by the shock wave coming off the front of the aircraft. The aircraft displaces a large volume of air, and creates a vacuum trailing the craft. The tail end of this vacuum cavity creates a second shock wave. On smaller aerodynamic craft, the cavity might be right behind the tail of the craft, and the separation between the shock fronts is not enough to be able to discern them as distinct booms. On larger and faster aircraft, the cavity can trail significantly behind the tail, and thus create a significant enough separation that two distinct booms are heard.

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A double sonic boom is caused by two shock waves created when an object travels faster than the speed of sound. The first boom is from the initial shock wave created at the front of the object, and the second boom is from the rear shock wave when the object passes by.

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11mo ago
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Q: What causes a double sonic boom?
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