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speed of light slowing down

The exact speed is 299,792,458 meters per second. Since that time the speed of light has been determined with increasing accuracy. The possibility that the speed of light is not a “constant” after all and has been slowing down is highly controversial and conjectural. When light propagates through a material, it travels slower than the vacuum speed, c.This is a change in the phase velocity of the light and is manifested in physical effects such as refraction.This reduction in speed is quantified by the ratio between c and the phase velocity. If true, virtually all aspects of traditional physics are affected, including the presumed steady state of radioactive decay used to measure geologic time. However, it does slow down when traveling through other common substances such as water (140,000 mi/sec), glass (124,000 mi/sec), and diamond (77,500 mi/sec). Once the light enters the ruby, its speed is slowed down to around the speed of sound (approximately 741mph) and the spinning motion of the rod drags the light with it, … The speed of light is a constant. Well, apparently a couple of Australian scientists have found evidence that points to the possibility that the speed of light is not actually constant and has been slowing down since the Big Bang. This photon, which is identical to the first, travels at the speed of light until it is absorbed by another atom and the process repeats. Quote: On Sat, 24 Jan 2015 07:38:27 +0100, Poutnik

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