Y audio signals cannot be transmitted by electro magnetic waves'
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Because sound is by definition compression waves in a physical medium, not electromagnetic waves. It is just like asking why a cat is not a dog - they are simply differnt things altogether, there's no _why_ to it.
If you are asking instead why you do not have radio-style signals in the audio frequencies, you do. The problem is that as the frequency gets lower the wavelength gets longer and longer, and as such the antenna needed to transmit also get longer and longer. However, radio at such low frequencies has some interesting properties - in particular, it is able to pass through water and even solid rock unimpeded. As such both the US and Russian navies have transmitting stations to issue orders to their submarines while they are still deeply submerged. However, in both cases the antenna are literally hundreds of miles long, so this is completely impractical for non-military applications.
If you are asking instead why you do not have radio-style signals in the audio frequencies, you do. The problem is that as the frequency gets lower the wavelength gets longer and longer, and as such the antenna needed to transmit also get longer and longer. However, radio at such low frequencies has some interesting properties - in particular, it is able to pass through water and even solid rock unimpeded. As such both the US and Russian navies have transmitting stations to issue orders to their submarines while they are still deeply submerged. However, in both cases the antenna are literally hundreds of miles long, so this is completely impractical for non-military applications.
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