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Beginning of Paper
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Radio: A Form of Communication
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 betwee ....
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Middle of Paper
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.... in another
conductor placed in this changing magnetic field. This principle of
electromagnetic induction is well known in the application of transformers,
where an iron core is used to link the magnetic field of the first wire or coil
with a secondary coil. By this means voltages can be stepped up or down in value.
This process is usually carried out at low frequencies of 50 or 60 Hz (Hertz, or
cycles per second). Radio waves, on the other hand, consist of frequencies
between 30 kHz and 300 GHz.
In 1864, James Clerk Maxwell published his first paper that showed by
theoreti ....
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SUBJECTS
