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1 E layer: The next layer beyond the D layer is called the E layer. 2  This exists at an altitude of between 100 and 125 km. 3  Instead of acting chiefly as an attenuator, this layer reflects radio signals although they still undergo some attenuation.
But by definition radio waves are not sound waves. Radio waves can travel in a vacuum, but sound waves need a physical medium. To explain â¦ the apparent contradiction, the sound wave is converted to an electrical signal version that is then used to modulate the radio signal. 3 people found this useful. Asif Shaik.