真空中光速为什么是 299792458 米/秒? - 知乎
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1983年,结合一系列实验(特别是定义“秒”的),第17届国际计量大会将光速定义为一个基本的计量基准,直接定义光速为299792458米/秒 。 人们容易理解定义数据应该与历史上的实验契合,而很难看出这个数据如何达到9位精度。
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