An electromagnetic wave having a low frequency and long wavelength. Radio waves are used for the transmission of both radio and television broadcasts. They also include the microwaves used for cooking. Some celestial objects, such as pulsars, also emit radio waves. See more atelectromagnetic spectr...
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。 柯林斯例句 Vast amounts of energy, from X-rays right through the spectrum down toradio waves, are escaping into space. ...
Wavelength-to-frequency conversions of radio waves are really quite simple because wavelength and frequency arereciprocals: Either one divided into the velocity of a radio wave yields the other. Remember, the formula for wavelength is: The wavelength in meters divided into 300,000,000 yields thefre...
What are radiofrequency (RF) waves and how are they produced? The electromagnetic spectrum used in NMR corresponds to "radio waves" used in commercial communications. MRI involves the absorption and emission of energy by nuclei at a specific resonant(Larmor) frequency.The Larmor frequency scales di...
radio-frequency wavesstabilitytransport barrierkinetic theoryThe effect of radio-frequency (RF) waves on negative-energy perturbations (NEPs) is investigated in a straight stellarator within the framework of the Maxwell and drift kinetic theories. It is found that the ponderomotive force and its radial...
Radio waves are the lowest-energy, lowest-frequency and longest-wavelength electromagnetic waves. They are produced when analternating currentflows in an aerial and they spread out and travel through the atmosphere. They are not strongly absorbed by the atmosphere. Another aerial is used as a detec...
What are Radio Waves? Electromagnetic energy travels in the form of waves that have a broad range of frequencies called the electromagnetic spectrum. The diagram in Fig. 1 shows the different types of electromagnetic radiation, based on frequency. The frequency of a wave, given in hertz (Hz),...
(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,microwaves,infrared(IR), visible light,ultraviolet(UV),X-raysandgamma-rays....
Radio frequency (RF) is the part of the electromagnetic spectrum in which electromagnetic waves can be generated and fed through an antenna. From: Ciottone's Disaster Medicine (Second Edition), 2016 About this pageAdd to MendeleySet alert ...
radiation at a longer wavelength. A maser is formed when a group of molecules is energized, and then exposed to a certain frequency of radiation. This causes them to emit radio photons. If an energy source re-energizes the molecules, this resets the process, and a maser is emitted again....