[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] ...
radio waves 释义 无线电波 实用场景例句 全部 radio wavesfrom outer space 来自外层空间的无线电波 《牛津高阶英汉双解词典》 Sound waves, light waves, andradio waveshave a certain frequency, or number of waves per second. 声波、光波或无线电波等都有特定的频率,或者说是每秒的波数。
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]...
high-frequency radio waveHFtheoryfull wave theorygeometrical opticsplasma conductivity/ A9420B Ionospheric electromagnetic wave propagation B5210C Radiowave propagationDivided into eight groups, those papers detailing the main developments of the field of HF radio waves are sketched in as condensed a ...
In the late 1940s, experimenting with high-frequency radio waves, Percy L. Spencer of the Raytheon Company soon invented the microwave (), which made millions of dollars for Raytheon and millions of bags of popcorn for kids everywhere. A.bomb B.prospect C.stove D.oven 相关知识点: 试题来...
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
DURING the period autumn 1949 鈥 spring 1950, a series of measurements of field-strength from a very-high-frequency airborne transmitter was made at the Royal Aircraft Establishment. The main purpose of the investigations was to examine the field-strengths obtained in varying weather conditions ...
The radio-frequency spectrum is a relatively small part of theelectromagnetic (EM) spectrum. The EM spectrum is generally divided into seven regions in order of decreasing wavelength and increasing energy and frequency, according to theUniversity of Rochester. The common designations are radio waves,...
As compared to other waves such as gamma or ultraviolet waves, they have lesser amounts of energies. In addition to this, the wavelengths of microwaves and radio waves are larger than that of visible light and hence their frequency is comparatively low.Complete step b...
Electromagnetic radiation - Radio Waves, Frequency, Wavelength: Radio waves are used for wireless transmission of sound messages, or information, for communication, as well as for maritime and aircraft navigation. The information is imposed on the electr