| Mecron |
2012-03-01 10:50 |
國內(nèi)教材翻譯的不對，群速度可以超光速。你可以參考Claus Klingshirn的Semiconductor Optics,3rd Ed第98頁最后一段：
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For a discussion of the fact, that both the phase- and group velocities can exceed for some frequenciyes the vacuum speed of light. It should be noted, however, that the signal and energy transport velocities never exceed c. y?UB?2 VN
老一輩中英語不好真是害死后代��！
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