What causes the noise when breaking the sound barrier?

Answer 1

762 mph at sea level breaks the sound barrier

Answer 2

Breaking the sound barrier means that an object is moving faster than the velocity of sound. The speed of sound is 343 meters per second or 1,125 feet/second. When an object moves just below the speed of sound the sound it makes builds up preassure waves. When it reaches the speed of sound these pressure waves can not compress any more. They effectively create a "Wall of Air." "Breaking the sound barrier" means that an object has enough force to push through this barrier. Once this has been accomplished sound waves no longer build up in front of the object.

Answer 3

When the sound barrier is broken, a shock wave is created, exterior temperature of the -craft increases due to friction, and drag increases.

2nd answer:

The above is a great answer!! But, to dispel one of the common myths believed even by some Air Force officers, the sonic boom is NOT a one-time occurence as the sound barrier is broken. What actually happens, as mentioned in the excellent answer, above, is that the shock wave hits the earth (and all other directions, too, but we are only on earth to hear it . . .) just like a boat moving across the lake sends out a vee-shaped wave. We can see the wave, and we can feel the result: the dock or boat we're standing on rocks back and forth for a little bit.

Same thing with an airplane (or even an automobile, these days) Once the plane or car is traveling over the speed of sound, that wave that hits us on the ground is something we can feel. We feel it in our ears, and sometimes in our whole bodies as a loud "BANG". But all it is is that wave hitting us at a speed above the speed of sound. A few seconds or more later, the same wave which travels along behind the plane or car might hit your buddy a few blocks away, and she will hear the same "BANG" that you did, only a bit later in time.

Answer 4

Waves of air that would normally be in front of the aircraft are suddenly pushed aside and behind as the aircraft flies faster than the sound waves ahead and it's the air being forced behind that causes the boom

Answer 5

If you travel past 741mph the sound barrier is broken.

Don't worry tho, its self repairing.

Answer 6

Breaking the "sound barrier" causes a shock wave in the air that may be perceived by those on the ground as a sonic boom.

Answer 7

going faster than the speed of sound

Answer 8

Charles E. Yeager

Answer 9

343 m/s is the speed that breaks the sound barrier.

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