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If sound waves generate energy, is there any way to capture that energy (in places like airports, noisy cities, subways, etc) and use it as an alternate energy source?
Answer 1:

Converting sound to electrical energy is exactly what a microphone does. Unfortunately, the amount of energy in sound is actually very small. Someone yelling at the top of their lungs only produces about 0.1 Watts. A jet takeoff at 140 dB (an extremely loud sound) only produces about 100 Watts per square meter. Even then, the jet is only near the microphone for a few seconds, not long enough to produce useful energy.


Answer 2:

The amount of energy contained within the sound waves in such places is so small that it is of little value.



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