Description: Microwaves are electromagnetic waves that range from a frequency of about 1
gigahertz and a wavelength on the order of 30 cm to a frequency of about
300 gigahertz and a wavelength on the order of 1 mm. This range of
frequencies overlaps with the shorter radio waves. Uses: Microwaves are often used to carry broadband telegraphy signals (telephone
and television) between stations on the Earth as well as between Earth
stations and communications satellites. Microwaves are also used to
communicate with space probes.
Microwaves are also commonly used for heating and cooking food. They are
absorbed by water and fats and thus heat food from within. Facts: - Microwave transmitters and receivers are parabolic dish
antennas.
- Microwaves are used for radar systems, which are used to
track the position and speed of various objects.
- Microwaves are commonly generated by devices known as the klystron
(primarily used for communications applications) and the magnetron
(primarily used for radar and microwave ovens). Solid state devices such as
the Gunn diode and the tunnel (or Esaki) diode, as well as the maser (an
acronym for "microwave amplification by stimulated emission of
radiation") are also used to generate microwave radiation.
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