It was originally believed that the speed of light was not constant. Light, which is a form of electromagnetic wave, is a phenomenon that has puzzled scientists for centuries. "The meter is the length of the path traveled by light in vacuum during a time interval of 1/299,792,458 of a second." National Institute of Standards and Technology. Historical Content of the SI: Unit of Length (Meter). "and a few years later Newton wrote in the Principia (Book I, section XIV): 'For it is now certain from the phenomena of Jupiter's satellites, confirmed by the observations of different astronomers, that light is propagated in succession (NOTE: I think this means at finite speed) and requires about seven or eight minutes to travel from the sun to the earth.'" "regardless of the motion of the observer, the speed of light always came out to be the same value, c = 3 × 10 8 m/s, with respect to the experimenter."įowler, Michael. New York: Simon & Schuster Macmillan, 1996. "Light, Electromagnetic Theory of." Macmillan Encyclopedia of Physics.
"The speed of light in empty space- where atoms do not delay its travel- is 186,282 miles (299,792 kilometers) per second." "The waves travel through a vacuum with the speed of light c, where "
Physics for Scientists and Engineers, Fifth Edition.
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