if you were travelling at twice the speed of sound .would you hear an echo?

Answer 1

Good question.
No. If you are travelling faster than the speed of sound (faster than Mach 1), you can not hear an echo of the sounds that you make.

In order to hear an echo, the sound must travel from your location, bounce off something, and return to you.

If you are travelling faster than Mach 1, all of the sound that you make is behind you. Whether it bounces or not, it can not come back to you, because once it's behind you it can't catch up with you.

Here's an interesting thought:
If you subsequently slow down to less than Mach 1, then the sounds that you made while travelling faster than Mach 1 will start catching up with you. When you hear those sounds, they will not be echos in the sense of "sound that BOUNCED back to you." But you would experience the same effect as an echo (a sound that emanated from you, and later reached your ears).

Answer 2

The answer is: perhaps. (It's not clear what you're asking ... are you wondering if faster-than-sound travel would *prevent* echos, or *cause* them?)

If you are *inside* an airplane travelling at 2x speed of sound, then, yes, you could hear an echo. Why? Because sound travels through air, and the air inside the airplane is being carried along with you (in the same way that you don't experience wind when you're inside a car (with windows closed) or an airplane no matter how fast it is traveling).

So sound inside the airplane behaves exactly as it would if the plane were sitting on the ground.

So if you built a little echo chamber inside the plane, you could hear an echo just fine.

But there's nothing unsual about traveling at faster than the speed of sound that would *cause* an echo inside the plane.

Answer 3

I think I understand your question and the answer is no. You are creating a shock wave and you would not get any echo at any speed above the speed of sound.

Answer 4

no you wont becase you will be traveling faster than the speed of which the sound is.
or it could be propelled by your speed and go say 3x the speed of sound and make a massive sonic boom and you might hear an echo but it would be so fast you wont hear it well enough.

Answer 5

nope. Unless you are in some other medium, like iron or water. The speed of sound is lowest in air, and highest in iron*or at least, that's how i know*. So, you might hear an echo in water when you count the speed of sound in air.

Answer 6

No. You would be travelling faster than the sound of the echo so it would not catch up with you.

Answer 7

It depends if you were travelling toward or away from the source of the echo, and whether or not you had your fingers in your ears.

Answer 8

Ummmmmm, No. iIf You are moving 2x the speed of sound, how could You hear it? It might create a sonic boom, but I doubt You could hear it while traveling @ that speed.

Answer 9

probably if it were from something travelling at four times the speed of sound

Answer 10

no i dont think so ., the only think you would hear is
ground control to major tom