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A receiver that picks up waves that carry sound is called a radio. A radio sends the electric signal through speakers so the sound can be heard. Each radio station sends out radio waves of a certain frequency. A person changes a radio from one frequency to another to hear different stations.

1. a. : the wireless transmission and reception of electric impulses or signals by means of electromagnetic waves. b. : the use of these waves for the wireless transmission of electric impulses into which sound is converted.

The term ?radio communication? or ?communication by radio? means the transmission by radio of writing, signs, signals, pictures, and sounds of all kinds, including all instrumentalities, facilities, apparatus, and services (among other things, the receipt, forwarding, and delivery of communications) incidental to such ...

In 1895, a young Italian named Gugliemo Marconi invented what he called ?the wireless telegraph? while experimenting in his parents' attic. He used radio waves to transmit Morse code and the instrument he used became known as the radio.

Radio broadcasts provide real-time information, and some that broadcast 24 hours a day, can provide the most recent updates to listeners. Radio has the ability to reach across borders and can become a valuable source of information where reliable news is scarce.

Radio is a way to send electromagnetic signals over a long distance, to deliver information from one place to another. A machine that sends radio waves is called a transmitter, while a machine that "picks up" the signals is called a receiver or antenna. A machine that does both jobs is a "transceiver".