When you pass Mach 1, the plane travels faster than the waves itself and that move across the so-called sound barrier produces a large sound, which is the sonic boom. At under Mach 1, these waves propagate in front of a plane. ![]() Planes produce sound waves when they travel. And regulators have determined that people need to be protected from sonic booms. ![]() Why? Breaking the sound barrier leads to a sonic boom.
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