單色光也有群速度概念。前麵說的本征波琴玄形成駐波時就是這個情況。單色波是無限長的周期波。也有相速和群速的。

來源: 桃花源主於 2018-11-07 17:16:36 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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