The sonic boom isn’t a one time phenomenon, it is ongoing aslong as the aircraft is moving at supersonic speeds, it’s caused by a shockwave that supersonic travel causes
https://images.app.goo.gl/ZocwN1K8dHtr1EiB9
This image shows what happens, as a sound emitter travels at supersonic speeds, all of the sound waves meet up at a unified front trailing behind the aircraft, this shockwave is what you hear as the sonic boom as it passed over you.
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