+18 Speed Of Light Is Constant Or Not Ideas. Web it can be derived from maxwell's equations that the speed at which electromagnetic waves travel is: Can light's velocity be constant while the universe expands ?

Web the speed of light in vacuum, commonly denoted c, is a universal physical constant that is exactly equal to 299,792,458 metres per second (approximately 300,000 kilometres per second; Exactly why the universe requires constants remains unknown, and why the speed of light has the value it does is also unknown. The speed of light is constant.









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