| 单词 | plasma frequency |
| 释义 | > as lemmasplasma frequency plasma frequency n. Physics the natural resonant frequency of a plasma oscillation, equal to the minimum frequency of electromagnetic waves that can travel through the plasma without attenuation (the value is approximately 8920√n Hz, where n is the number of free electrons per cubic centimetre). ΘΚΠ the world > matter > physics > atomic physics > ion > plasma or ionized gas > [noun] > oscillation of electrons in > frequency of plasma frequency1949 1929 Physical Rev. 33 198 Thus the lower frequency limit for long waves coincides with the plasma-electron frequency.] 1949 Physical Rev. 75 1852/1 For a typical density of 1012 electrons per cm3, the plasma frequency is about 1010 c.p.s. 1964 D. B. Newman Space Vehicle Electronics iv. 225 Above the plasma frequency the plasma has dielectric properties... Well below the plasma frequency, the plasma acts like a conductor. 1980 Sci. Amer. Sept. 186/2 If the frequency of the radio signal is higher than the plasma frequency, the signal continues to travel through the ion layer. < as lemmas |
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