| 单词 | group velocity |
| 释义 | > as lemmasgroup velocity group velocity n. Physics the speed at which the energy of a wave or wave group travels.So called because if the sinusoidal components of a wave group do not differ greatly in frequency, the velocity of energy transmission is the speed at which the group as a whole travels. ΘΚΠ the world > matter > physics > mechanics > types of motion > [noun] > wave > series of waves > velocity of group velocity1881 1877 Ld. Rayleigh in Proc. London Math. Soc. 9 22 The velocity of the group is (κV'−κV)÷(κ'−κ).] 1881 Ld. Rayleigh in Nature 25 Aug. 382/1 I have investigated the general relation between the group-velocity U and the wave-velocity V. 1932 A. W. Ladner & C. R. Stoner Short Wave Wireless Communication iii. 34 For the case of a group of waves passing through an ionised medium..the phase velocity will be greater than c, the velocity of light in a pure dielectric,..but the group velocity will be less than c. 1954 D. J. Hughes Neutron Optics i. 7 It is customary to use the wave picture for refraction of light and to refer to the phase velocity, whereas the group velocity (the observable particle velocity) is used in connection with neutrons. 2005 R. E. Newnham Properties of Materials xxiii. 258 The group velocity of an elastic wave is the velocity of energy flux. < as lemmas |
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