Radio: A Form of Communication
Physics
Idoh Gersten
Mr. Zambizi
Physics
March 12, 1995
Radio is a form of communication in which intelligence is transmitted without
wires from one point to another by means of electromagnetic waves. Early forms
of communication over great distances were the telephone and the telegraph. They
required wires between the sender and receiver. Radio, on the other hand,
requires no such physical connection. It relies on the radiation of energy from
a transmitting antenna in the form of radio waves. These radio waves, traveling
at the speed of light (300,000 km/sec; 186,000 mi/sec), carry the information.
When the waves arrive at a receiving antenna, a small electrical voltage is
produced. After this voltage has been suitably amplified, the original
information contained in the radio waves is retrieved and presented in an
understandable form. This form may be sound from a loudspeaker, a picture on a
television, or a......
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Approximate Word Count: 2924
Approximate Pages: 12 (260 words per double-spaced page) |