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Radio Waves


In the modern society, radio is the most widely used medium of
broadcasting and electronic communication : it plays a major role in many areas
such as public safety, industrial manufacturing, processing, agriculture,
transportation, entertainment, national defense, space travel, overseas
communication, news reporting and weather forecasting. In radio broadcasts, they
use the radio waves which can be both microwaves and longer radio waves. These
are transmitted in two ways: amplitude modulation (AM ) and frequency modulation
( FM ). These two kinds of wave have many differences.

Radio waves are among the many types of electromagnetic waves that
travel within the electromagnetic spectrum. Radio waves can be defined by their
frequency (in hertz, after Heinich Hertz , who first produced radio waves
electronically), which is number of times they pass through a complete cycle per
second; or by their wavelength, which is determined by the distance (by meters)
that is......

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Approximate Word Count: 788
Approximate Pages: 4 (250 words per double-spaced page)

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