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27 September, 16:00

How was the speed of light determined and what is it's value?

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  1. 27 September, 17:26
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    The 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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