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by toemetoch
5138 days ago
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... and audio waves can be well into the ultrasonic range and into the UHF regime. Theoretically, at sea level on earth, the mean free path of air molecules allows for 3.4 GHz. But attenuation is proportional to f^2 which results in an upper limit of 100MHz. You need a medium denser than air at sea level for higher frequencies. |
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