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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.
Sonic booms generate enormous amounts of sound energy, sounding much like an explosion; typically the shock front may approach 100 megawatts per square meter, and may exceed 200 decibels. 10 log (100 x 10^(6)/ 10^(-12)) = 200 dB.