Speed of light The speed of light in a vacuum is exactly 299,792,458 meters per second (m/s) (about 186,282.397 miles per second). The speed of light depends upon the medium in which it is traveling, and the speed will be lower in a transparent medium. Although commonly called the "velocity of light," technically the word velocity is a vector quantity, having both magnitude and direction ...
Light Resources Light can be narrowly defined as the visible portion of the electromagnetic spectrum. It is a type of energy, and it is made up of particles called photons. In a vacuum such as in space, light moves at 186,000 miles per second (300,000 kilometers per second), or what is called the speed of light. A broader definition would include infrared, ultraviolet, and x-ray wavelengths ...
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