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The sound barrier is formed by pressure waves building up on each other. Imagine a singer. If you have a second singer sing with them it sounds louder. Add more singers and the loudness goes up. This is because the sound waves are constructively interfering with each other or building up. The same happens with the sound barrier. The pressure wave built up has a very high intensity but, because all of the sound waves occupy the same space, the wave creates a very short, but loud "Boom."

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14y ago
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15y ago

A cloud forms behind an airplane when it breaks the sound barrier because the airplane pushes the air to the side to launch the plane forward in a way that causes the air to become visible for a short period of time (it's not really a cloud, but visible air).

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13y ago

It does, but it does not make a sonic boom. Light is made of photons, which are weightless, and don't make sound. No sound, no sonic boom.

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Q: Why does light not break the sound barrier?
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