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...
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...
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 ...
1Microwave communication uses (71) -frequency radio waves that travel in straightline sthrough the air. Because the waves cannot (72) with the curvature of the earth, they can be (73) only over short distance. Thus, microwave is a good (74) for sending data between buildings in a city ...
[translate] 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] ...
[translate] aenergy depend on the frequency. For example, visible light has a frequency between 能量取决于频率。 例如,可见光有一个频率之间 [translate] aand radio waves have lower frequencies (longer wavelengths). The radio frequency 并且无线电波有更低的频率(更长的波长)。 射频 [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 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
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...
Frequency changer to radio in waves maintainedABRAHAM HENRI