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“光”跑的这么快，它的速度是如何测量的？
source link: https://tech.sina.com.cn/d/s/2018-10-16/doc-ihmhafir9158310.shtml
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来源：中国科普博览想必大家在日常生活中都有这样的经验，在雷雨天气，我们总是先看到闪电的光，然后过了好久才听到轰隆隆的雷声。这其中的原因也不难理解，那就是因为光的速度比声音的速度快多了。空气中声音的速度大概是340m/s，一马赫的速度，就是指
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