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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.
The infrared (IR) radiation has a longer wavelength (and a lower frequency) than ultraviolet (UV) radiation. The former is below the visible spectrum, and the latter is above â¦ that visible (sometimes called optical) spectrum.However, IR radiation does not have the longest wavelength in the Electromagnetic Spectrum.That would be the Radio Waves. Additionally,: The prefix Infra-suggests standing under, sub-, inferior to (IR: Standing under Red light waves) The prefix Ultra-suggests standing beyond Violet light waves.owever, IR radiation does not have the longest wavelength in the Electromagnetic Spectrum. That would be the Radio Waves. Additionally,: The prefix Infra-suggests standing under, sub-, inferior to (IR: Standing under Red light waves) The prefix Ultra-suggests standing beyond Violet light waves.