2.A range of radio frequencies assigned by a regulatory agency for use by a given group or organization. 3. a.A range of values of a quantity or set of related quantities:the income spectrum. b.A sequence or range of related qualities, ideas, activities, entities, or phenomena:the whole...
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Radio waves are transmitted as a series of cycles, one after the other. Thehertz(abbreviated Hz) is equal to one cycle per second. Hertz was named afterHeinrich Hertz, a German physicist[1857-1894]who experimentally proved the existence of electromagnetic waves. You may have noticed that the ...
1.seismic disturbance range of frequencies地震扰动的频率范围 2.the entire frequency range of electromagnetic waves.电磁波的全部频率范围。 3.upper limit of the nominal of use for frequency标称使用频率范围上限 4.High stability of capacitance and DFversus wide temperature and frequency range.高温度,频率...
aMicrowaves, which have a higher frequency than ordinary radio waves, are used routinely in sending thousands of telephone calls and television programs across long distances. 微波,比普通的无线电波有一个更高的频率,在送定期地使用数以万计电话和电视节目横跨长的距离。[translate]...
百度试题 结果1 题目 Radio frequency () waves are a mode of transportation for information and carriers for RF waves are air, copper wire and fiberoptic cable. ( ) 相关知识点: 试题来源: 解析 正确 反馈 收藏
Radio frequency (RF) refers to the rate of oscillation of electromagnetic radio waves in the range of 3 kHz to 300 GHz, as well as the alternating currents carrying the radio signals. This is the frequency band that is used for communications transmission and broadcasting. Although RF really ...
Radio frequency Radio frequency (RF) is a frequency or rate of oscillation within the range of about 3 Hz to 300 GHz. This range corresponds to frequency of
Divided into eight groups, those papers detailing the main developments of the field of HF radio waves are sketched in as condensed a fashion as possible. These groups are full wave theory, geometrical optics and conductivity during the 1950s, the same topics during the 1960s, and full wave ...
Power line frequency (normally 50 Hz or 60 Hz). Variable-frequency drives, which normally use a 1-20 kilohertz (kHz) carrier frequency. Audio frequency range: 15 Hz to 20 kHz (the range of human hearing). Radio frequency: 30-300 kHz. Low frequency: 300 kHz to 3 megahertz (MHz). Med...