An electromagnetic wave of relatively short wavelength, spec. a radio wavelength of less than about 100 metres, corresponding to a frequency of…
| 单词 | θ197909 |
| 释义 | society > communication > telecommunication > radio communications > [noun] > radio wave > length of > specific (7) short wave1839 An electromagnetic wave of relatively short wavelength, spec. a radio wavelength of less than about 100 metres, corresponding to a frequency of… medium wave1928 a radio wave with wavelength between a hundred metres and a kilometre (see quot. 1929 for former limits); a waveband including such wavelengths… MW1938 = medium wave n. at medium, n. adj.compounds 2. long wave1965 An electromagnetic wave of long wavelength; (Telecommunications) a radio wave with a wavelength in a particular range of wavelengths, typically… Subcategories:— short waveband for private communication (3) |
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