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单词 θ78397
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the world > matter > physics > electromagnetic radiation > electronics > electronic phenomena > [noun] > frequency > radio frequency (4)
radio frequency1915

A frequency in the range of the electromagnetic spectrum suitable for telecommunication, less than that of the shortest infrared waves and generally…

radio range1926

The part of the electromagnetic spectrum comprising radio waves; the radio spectrum.

radio spectrum1927

the part of the electromagnetic spectrum comprising radio waves; (also) the spectrum of a particular source at radio frequencies.

radio1968

Astronomy. The part of the electromagnetic spectrum comprising radio-frequency wavelengths. Esp. in in the radio.

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