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Light travels as a "wave" and interacts with matter as a "particle".
Electromagnetic radiation that the human eye can detect as light. From radio waves with wavelengths measured in metres to gamma rays with wavelengths shorter than roughly 1 1011 metres, electromagnetic radiation occurs throughout a very broad range of wavelengths. The wavelengths of light that are visible to humans fall into a very small range within that wide spectrum, ranging from about 700 nanometers (nm; billionths of a metre) for the red light to roughly 400 nm for violet light.
Infrared and ultraviolet are two spectral bands that are close to the visible band and are frequently referred to as light as well. A fundamental physics constant, the speed of light in a vacuum is currently accepted to be 299,792,458 metres per second.
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