microwave


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microwave,

electromagnetic wave having a frequency range from 1,000 megahertz (MHz) to 300,000 MHz, corresponding to a wavelength range from 300 mm (about 12 in.) to 1 mm (about 0.04 in.). Like light waves, microwaves travel essentially in straight lines. They are used in radar, in communications links spanning moderate distances, and in other applications, such as microwave ovensmicrowave oven,
device that uses microwaves to rapidly cook food. The microwaves cause water molecules in the food to vibrate, producing heat, which is distributed through the food by induction. A special electron tube called a magnetron produces the microwaves.
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. The equipment used to generate, process, and transmit microwaves is in many respects different from that used with lower frequency radio waves. See waveguidewaveguide,
device that controls the propagation of an electromagnetic wave so that the wave is forced to follow a path defined by the physical structure of the guide. Waveguides, which are useful chiefly at microwave frequencies in such applications as connecting the output
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; magnetronmagnetron
, vacuum tube oscillator (see electron tube) that generates high-power electromagnetic signals in the microwave frequency range. Its operation is based on the combined action of a magnetic field applied externally and the electric field between its electrodes.
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.

microwave

[′mī·krə‚wāv]
(electromagnetism)
An electromagnetic wave which has a wavelength between about 0.3 and 30 centimeters, corresponding to frequencies of 1-100 gigahertz; however, there are no sharp boundaries distinguishing microwaves from infrared and radio waves.

microwave

a. electromagnetic radiation in the wavelength range 0.3 to 0.001 metres: used in radar, cooking, etc.
b. (as modifier): microwave generator

microwave

Meaning "small wave," a microwave is a radio signal in the frequency range from 300 MHz to 300 GHz or from 1 to 300 GHz, depending on the rating system. Except for AM and FM radio, shortwave radio and over-the-air TV, almost all other communications systems transmit microwaves, including satellites, cellular systems, wireless LANs and line-of-sight between buildings and across vast distances. See spectrum and millimeter wave.


Early Microwave Tower
Line-of-sight microwaves were first used to transmit across long distances where the terrain was too difficult to lay cable. This tower was installed in 1969 in Boulder Junction, Colorado. (Image courtesy of AT&T.)
References in periodicals archive ?
researcher," who wrote an article in 1996 claiming that Cold War research in the Soviet Union had proven the dangers of microwave ovens.
Microwave popcorn can be used in the recipe, but we thought it tasted too salty.
Microwave ovens are in 84 percent of America's homes, and industry spokespeople claim they are completely safe.
Those relatively large hot and cold spots in the CMB, which the spaceborne Microwave Anisotropy Probe will detect, represent the seeds from which galaxies and galaxy clusters ultimately arose.
Cover with plastic wrap, vent and microwave on HIGH (100%) 1 to 2 minutes for each 2 servings until hot and bubbly.
Microwave energy, on the other hand, can penetrae deeper into the food.
The interlock status panel provides information on the status of each microwave power source, cooling water flow and interlock status of the access doors.
Saab Microwave Systems AB is a leading supplier of Radar Systems.
Determining the heating performance characteristics of microwave ovens.
1 cup whipping cream, heated to boiling in microwave oven (about 1 1/2 minutes)
In 1991, the Cosmic Background Explorer first revealed fluctuations in the microwave background but averaged temperature variations over huge patches of sky.

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