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29 June, 06:50

What new technologies are used in determining the speed of light?

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  1. 29 June, 08:29
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    speed of light in a vacuum stands at "exactly 299,792,458 metres per second". The reason today we can put an exact figure on it is because the speed of light in a vacuum is a universal constant that has been measured with lasers; and when an experiment involves lasers, it's hard to argue with the results.
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