Electromagnetic waves in a vacuum travel with the speed of light.

Name: Electromagnetic waves in a vacuum travel with the speed of light.
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This is a well-established fact in physics. The speed of light in a vacuum is approximately 299,792,458 meters per second, and all electromagnetic waves, including radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays, travel at this speed in a vacuum.

Electromagnetic Waves in a Vacuum Travel with the Speed of Light