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A telephone, or phone, is a telecommunications device that permits two or more users to conduct a conversation when they are not in the same vicinity of each other to be heard directly
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The effect was that, in a vacuum, electrons flow from a heated element -- like an incandescent lamp filament -- to a cooler metal plate.
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Electromagnetic waves are formed when an electric field (shown as blue arrows) couples with a magnetic field (shown as red arrows). The magnetic and electric fields of an electromagnetic wave are perpendicular to each other and to the direction of the wave.
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itailian inventor sent and recieved first radio signal in 1895
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An electron can be bound to the nucleus of an atom by the attractive Coulomb force. A system of one or more electrons bound to a nucleus is called an atom. If the number of electrons is different from the nucleus' electrical charge, such an atom is called an ion.
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In 1906 ,
Lee De Forest created (borrowed) the idea for the audion tube, a vaccum tube that amplified signals -
In 1922 WEAFF Aired a 10 minute "commercial" or toll broadcast , for an apartment complex charging $50.
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Uncle Charlie was too popular , established FRC in 1927
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T.V. makes appearance in the late 30's
