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Electromagnetic waves travel through a vacuum at the speed of light. Whether that electromagnetic wave is a radio wave, a microwave, light, an X-ray or a gamma ray, it will move through a vacuum at a fixed speed -- the speed of light. We use c to indicate this speed, and it's about 186,282 miles per second, or exactly 299,792,458 meters per second. A link can be found below for more information.

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Related Questions

How fast do all electromagnetic waves travel?

All electromagnetic waves travel at the speed of light, which is approximately 299,792 kilometers per second in a vacuum.


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How fast are radio signals compared to other forms of electromagnetic waves?

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How much faster are electromagnetic wave than sound waves?

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