Difference between revisions of "Radio"
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==Origin== | ==Origin== | ||
| − | The etymology of "radio" or "radiotelegraphy" [[reveals]] that it was called "[ | + | The etymology of "radio" or "radiotelegraphy" [[reveals]] that it was called "[https://en.wikipedia.org/wiki/Wireless_telegraphy wireless telegraphy]", which was shortened to "wireless" in Britain. The prefix ''radio''- in the sense of wireless transmission, was first recorded in the word radioconductor, a [[description]] provided by the French physicist [https://en.wikipedia.org/wiki/%C3%89douard_Branly Édouard Branly] in 1897. It is based on the verb to [[radiate]] (in Latin "radius" means "spoke of a wheel, beam of [[light]], ray"). This [[word]] also appears in a 1907 article by [https://en.wikipedia.org/wiki/Lee_De_Forest Lee De Forest], it was adopted by the [https://en.wikipedia.org/wiki/United_States_Navy United States Navy] in 1912, and became common by the time of the first commercial broadcasts in the United States in the 1920s. (The noun "broadcasting" itself came from an [[agricultural]] term, meaning "scattering [[seeds]] widely".) The term was then adopted by other [[languages]] in Europe and Asia. British Commonwealth countries continued to mainly use the term "wireless" until the mid-20th century, though the magazine of the [https://en.wikipedia.org/wiki/BBC BBC] in the UK has been called [https://en.wikipedia.org/wiki/Radio_Times Radio Times] ever since it was first published in the early 1920s. |
| − | *[ | + | *[https://en.wikipedia.org/wiki/19th_century 1887] |
==Definitions== | ==Definitions== | ||
*1: of, relating to, or operated by [[radiant]] [[energy]] | *1: of, relating to, or operated by [[radiant]] [[energy]] | ||
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:d : [[controlled]] or directed by radio | :d : [[controlled]] or directed by radio | ||
==Description== | ==Description== | ||
| − | '''Radio''' is the transmission of [[signals]] through free [[space]] by modulation of [[electromagnetic]] waves with [[frequencies]] below those of visible [[light]]. [[Electromagnetic]] radiation travels by means of oscillating electromagnetic fields that pass through the air and the [[vacuum]] of [[space]]. [[Information]] is carried by systematically changing (modulating) some property of the radiated [[waves]], such as [ | + | '''Radio''' is the transmission of [[signals]] through free [[space]] by modulation of [[electromagnetic]] waves with [[frequencies]] below those of visible [[light]]. [[Electromagnetic]] radiation travels by means of oscillating electromagnetic fields that pass through the air and the [[vacuum]] of [[space]]. [[Information]] is carried by systematically changing (modulating) some property of the radiated [[waves]], such as [https://en.wikipedia.org/wiki/Amplitude amplitude], [[frequency]], phase, or [[pulse]] width. When radio waves pass an electrical conductor, the oscillating fields induce an alternating current in the conductor. This can be detected and [[transformed]] into sound or other signals that carry [[information]].[https://en.wikipedia.org/wiki/Radio] |
[[Category: Physics]] | [[Category: Physics]] | ||
Latest revision as of 02:37, 13 December 2020
Origin
The etymology of "radio" or "radiotelegraphy" reveals that it was called "wireless telegraphy", which was shortened to "wireless" in Britain. The prefix radio- in the sense of wireless transmission, was first recorded in the word radioconductor, a description provided by the French physicist Édouard Branly in 1897. It is based on the verb to radiate (in Latin "radius" means "spoke of a wheel, beam of light, ray"). This word also appears in a 1907 article by Lee De Forest, it was adopted by the United States Navy in 1912, and became common by the time of the first commercial broadcasts in the United States in the 1920s. (The noun "broadcasting" itself came from an agricultural term, meaning "scattering seeds widely".) The term was then adopted by other languages in Europe and Asia. British Commonwealth countries continued to mainly use the term "wireless" until the mid-20th century, though the magazine of the BBC in the UK has been called Radio Times ever since it was first published in the early 1920s.
Definitions
- 1: of, relating to, or operated by radiant energy
- 2: of or relating to electric currents or phenomena (as electromagnetic radiation) of frequencies between about 3000 hertz and 300 gigahertz
- 3a : of, relating to, or used in radio or a radio set
- b : specializing in radio or associated with the radio industry
- c (1) : transmitted by radio (2) : making or participating in radio broadcasts
- d : controlled or directed by radio
Description
Radio is the transmission of signals through free space by modulation of electromagnetic waves with frequencies below those of visible light. Electromagnetic radiation travels by means of oscillating electromagnetic fields that pass through the air and the vacuum of space. Information is carried by systematically changing (modulating) some property of the radiated waves, such as amplitude, frequency, phase, or pulse width. When radio waves pass an electrical conductor, the oscillating fields induce an alternating current in the conductor. This can be detected and transformed into sound or other signals that carry information.[1]
