質量是在靜止時的物質能量吧，光子不能在真空靜止，靜止質量這概念不存在。E=MC2 對光子可用E =PC 表達，p是動量

來源: 老鍵於 2023-12-02 18:32:13 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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