比如用光譜儀看鈉燈，兩條典型譜線有確定的間隔。要是鈉燈飛速遠離，看到的間隔就會變大，從變化量可以算出飛離的速度。

來源: pop4 於 2026-02-19 17:00:22 [舊帖] [給我悄悄話] 本文已被閱讀：次

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