# Speed of RF waves and IR waves is same as 3 * 10 ^8 m/s?

In space,if we want to measure the speed of RF waves and IR waves it will be roughly 3 * 10^8 m/s

( SPEED OF RF WAVES = SPEED OF IR WAVES = 3* 10^8 M/S )

is this correct ?

The different in the characteristic of rf waves and ir waves is because of wavelength and frequency.

i am correct or not ?

• In vacuum with $\epsilon = 1$ for all wavelengths, the speed of light is the speed of light for all wavelengths. So, yes, rf and IR propagate together. – Jon Custer Apr 6 '16 at 17:20
• i know in normal atmosphere, there will be a refraction phenomenon that acts on both waves and the magnitude of refraction depends on wavelength and particle size ... – user143252 Apr 6 '16 at 17:28
• Which is why I specified vacuum with constant $\epsilon = 1$ for all wavelengths. In fact, the measurements of rf, ir, and visible signals from astronomical bodies provides a good test of the properties of the vacuum across very long distances. – Jon Custer Apr 6 '16 at 17:43
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