physical constant. velocity. E = mc2. speed of light, speed at which light waves propagate through different materials. In particular, the value for the speed of light in a vacuum is now defined as exactly 299,792,458 metres per second. relativistic velocity combination.. The speed of light is a constant that is a defined value. It is exactly 299,792,458 meters per second. The speed of light is the rate at which light travels. The speed of light in a vacuum is a constant value that is denoted by the letter c and is defined as exactly 299,792,458 meters per second. Visible light, other electromagnetic radiation, gravity waves, and other massless particles travel.

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Speed of Light Facts, Information, History & Definition

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Light travels at a constant speed of 1,079,252,848.8 (1.07 billion) km per hour. That works out to 299,792,458 m/s, or about 670,616,629 mph (miles per hour). To put that in perspective, if you.. kilometers per hour (kph, km/h, kmh-1) Related categories:. Converter You are currently converting speed units from speed of light to kilometers per hour 1 c = 1079252848.8 kph. speed of light . c kilometers per hour . 1079252848.8 kph Conversion base : 1 c = 1079252848.8 kph.