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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.
1 The energy carried by a radio wave is low, while the energy carried by a gamma ray is high.  Different materials can block different types of light. More specifically, the earth's atmosphere only allows certain wavelengths of light to penetrate to the surface.