2007-09-28 23:05:47 · 12 answers · asked by Anonymous in Entertainment & Music ➔ Polls & Surveys
. wireless telegraphy or telephony: speeches broadcast by radio.
2. an apparatus for receiving or transmitting radio broadcasts.
3. a message transmitted by radio
2007-09-28 23:09:54 · answer #1 · answered by Anonymous · 2⤊ 1⤋
Radio is the wireless transmission of signals, 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. It does not require a medium of transport. Information is carried by systematically changing (modulating) some property of the radiated waves, such as their amplitude or their frequency. 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.
A radio system consists of a production system for audio or video , a transmitter and a receiver. The unit that we are normally using in our home is the receiver unit only.
Radio uses different frequency ranges for broadcasting.
There are FM (Frequency modulation) and AM (Amplitude modulation) radios.
Radio has wide range of applications, such as RADAR, SONAR, mobile phone, remore controls (IR also), broradcasting, etc
2007-09-29 06:38:09 · answer #2 · answered by Mac 2 · 0⤊ 0⤋
Radio is the wireless transmission of signals, 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. It does not require a medium of transport. Information is carried by systematically changing (modulating) some property of the radiated waves, such as their amplitude or their frequency. 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.
The word 'radio' is used to describe this phenomenon, and radio transmissions are classed as radio frequency emissions.
Early uses were maritime, for sending telegraphic messages using Morse code between ships and land. The earliest users included the Japanese Navy scouting the Russian fleet during the Battle of Tsushima in 1905. One of the most memorable uses of marine telegraphy was during the sinking of the RMS Titanic in 1912, including communications between operators on the sinking ship and nearby vessels, and communications to shore stations listing the survivors. The first radio couldnt transmitt sound or speech and was called the "wireless telegraph"
Radio was used to pass on orders and communications between armies and navies on both sides in World War I; Germany used radio communications for diplomatic messages once its submarine cables were cut by the British. The United States passed on President Woodrow Wilson's Fourteen Points to Germany via radio during the war. Broadcasting began from San Jose in 1909[5], and became feasible in the 1920s, with the widespread introduction of radio receivers, particularly in Europe and the United States. Besides broadcasting, point-to-point broadcasting, including telephone messages and relays of radio programs, became widespread in the 1920s and 1930s. Another use of radio in the pre-war years was the development of detecting and locating aircraft and ships by the use of radar (RAdio Detection And Ranging).
Today, radio takes many forms, including wireless networks and mobile communications of all types, as well as radio broadcasting. Before the advent of television, commercial radio broadcasts included not only news and music, but dramas, comedies, variety shows, and many other forms of entertainment. Radio was unique among methods of dramatic presentation in that it used only sound. For more, see radio programming.
2007-09-29 06:34:13 · answer #3 · answered by ky11 4 · 0⤊ 1⤋
you're on a computer, probably with the TV
on. you own maybe a cellphone, a mp3, and a
play station wii, and you don't know what a
radio is. you're serious, right?
2007-09-29 08:03:38 · answer #4 · answered by ? 5 · 0⤊ 0⤋
Cuba Gooding Jr.
2007-09-29 06:11:57 · answer #5 · answered by Pencils In The Wind 5 · 0⤊ 1⤋
www.wefunkradio.com
Now, that's THE radio.
2007-09-29 06:31:40 · answer #6 · answered by Bull Goose Loony 7 · 1⤊ 1⤋
http://en.wikipedia.org/wiki/Radio
all rights reserved 2007 2010
2007-09-30 12:49:03 · answer #7 · answered by seena 1 · 0⤊ 0⤋
Wireless telegraphy.
2007-09-29 06:16:56 · answer #8 · answered by Anonymous · 1⤊ 1⤋
an irish police invasion of your property at five in the morning
2007-09-29 06:20:19 · answer #9 · answered by majoti 5 · 0⤊ 1⤋
It plays music.
This is my radio.
http://www.lfm-nrw.de/funkfenster/images/goodnews-4.jpg
2007-09-29 06:09:35 · answer #10 · answered by chrissy 7 · 0⤊ 1⤋