Another quora member answered that light, which radio wave is too, does not ever slow down. Other forms of electromagnetic radiation are X-rays and light. The refractive index change with frequency. The speed is about 300 million metres per second. The electromagnetic waves in the frequency range of visible light is about the same in air as in vacuum. The speed of radio waves is approximately 186,000 miles per second, which is also the speed of light. The reason that radio waves travel at the speed of light is that they are a type of electromagnetic radiation. Radio waves travel at the speed of light, same as all electromagnetic waves. When waves of frequencies in the neighborhood of 100 kc/s are propagated at a height of a fraction of a wavelength above the earth's surface, their speed is reduced by an amount dependent upon the electrical conductivity of the earth. For overland transmission, the speed is about 299,250 km/s. Standing waves of UHF radio are used to measure the speed of radio waves, which we then compare with the measured speed of light.This is an important comparison: Maxwell realised that the waves that are a solution to the equations for electricity and magnetism had a speed similar to that measured for light. I seem to remember being taught in high school physics that radio waves only travelled at 200 million m/s, but can't find anything to back that up. Radio waves are electromagnetic energy, lower frequency forms of this type of energy that includes light and cosmic rays on the high frequency end that we are able to detect.
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