What type of electromagnetic waves is the fastest?

Electromagnetic waves in a vacuum are faster than in any other medium. In a vacuum, all electromagnetic waves propagate at the same speed. In other media, the speed varies with the frequency. read more

Current theory states that all light waves in the electromagnetic spectrum travel at the speed of light through a vacuum. This speed by definition is 2.99792458 * 10^8 m/s. This speed has been measured on radio waves, visible light, and gamma rays. read more

Electromagnetic waves in a vacuum are faster than in any other medium. In a vacuum, all electromagnetic waves propagate at the same speed. In other media, the speed varies with the frequency. For example, visible light of longer wavelengths is generally faster in glass than shorter wavelengths. read more