| carrier |
the electromagnetic wave that is modulated to transmit a signal; carrier wave. [1/6 definitions] |
| diathermy |
medical treatment of localized tissues by heating with electromagnetic waves. |
| echo |
a reflected electromagnetic wave, as in radar. [1/8 definitions] |
| ether |
formerly, the substance believed to constitute outer space, and to be the medium of electromagnetic waves, including light. [1/4 definitions] |
| frequency |
in physics, the number of electromagnetic waves that pass a certain point in a given time period. [1/3 definitions] |
| Hertzian wave |
an electromagnetic wave, such as a radio wave, produced when electricity is oscillated in a conductor. |
| interference |
the combining of electromagnetic waves so that a disturbance is produced, such as an unclear radio signal. [1/4 definitions] |
| long wave |
a low-frequency electromagnetic wave, usu. a radio wave that is longer than one thousand meters and below three hundred kilohertz in frequency. |
| maser |
a device that amplifies electromagnetic waves and concentrates them at a single microwave frequency (acronym for "microwave amplification by stimulated emission of radiation"). |
| microwave |
any extremely high-frequency electromagnetic wave whose wavelength is between one millimeter and one meter. [1/2 definitions] |
| modulate |
to vary the frequency, amplitude, phase, or the like of (an electromagnetic wave). [2/6 definitions] |
| modulation |
variation of the frequency, amplitude, phase, or the like of an electromagnetic wave. [1/3 definitions] |
| pickup |
a device for receiving sound or electromagnetic waves. [1/5 definitions] |
| radio |
the sending of communications by means of electromagnetic waves in the frequency range from ten kilocycles to three hundred thousand megacycles. [1/9 definitions] |
| radiofrequency |
any frequency of electromagnetic waves between approximately ten kilohertz and 300 gigahertz, that can be used for radio transmission. |
| radio wave |
an electromagnetic wave with a wavelength of between one millimeter and thirty thousand meters, or a frequency of between ten kilohertz and three hundred thousand megahertz. |
| receive |
to convert incoming electromagnetic waves into signals that are visible or audible. [1/10 definitions] |
| send |
to transmit (signals) by means of electromagnetic waves. [1/7 definitions] |
| spectroscope |
an optical instrument that enables examination, measurement, or recording of a spectrum by rendering its component electromagnetic waves, as of light or radiation, distinct and visible. |
| television |
the process of transmitting visual images in the form of electromagnetic waves over distances to be seen on a screen. (abbr.: TV) [1/3 definitions] |
| transmit |
to send a signal by electromagnetic waves. [1/6 definitions] |