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Every form of electromagnetic radiation, including all colors of visible light, have the same speed

in vacuum ... roughly 300 million meters (186,000 miles) per second.

To get technical about it ... The speed is slightly less in material media, and there are some so-called

"dispersive" substances in which the speed depends slightly on wavelength.

But in general and to a close approximation, all wavelengths of electromagnetic radiation have the

same speed, and it's what we call the "speed of light".

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15y ago

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