Radio


radio is a device that receives rado waves and converts them to audible sounds. Rado stations broadcast news and music in the form of rado waves that travel through the air for hundreds of kilometres. These rado waves are then picked up and converted into
sound signals by rado sets.
Radio waves
James Clark Maxwell predicted the existence of rado waves in 1864. German physicists,
Friedrich Kohlrausch, and Wilhelm Weber calculated that these waves would travel at
the speed of light. In 1888, German physicist Heinrich Hertz confirmed Maxwell’s
prediction and Rado waves are a form of electromagnetic radiation. These waves are invisible to our eyes. Hertz found that they could be reflected and refracted. Hertz was the first to send and receive rado waves. In recognition of his work the unit of frequency of a rado wave of one cycle per second is named hertz.
A rado set has an antenna that receives rado signals. The signals are then converted into sound The initial rado sets were very bulky. These sets were not able to receive signals properly and lacked voice clarity. The rado became a popular means of entertainment in the 1920s. It has again gained popularity in the 21st century.
Nikola Tesla


Nikola Tesla was an American inventor who created the design of the rado in 1892. He
parented a rado controlled robot- boat on 8 November 1898. The boat had an antenna
that transmitted rado waves. It was controlled by rado waves, which were Nikola Tesla received by a coherer The coherer was a rado-sensitive device that transmitted the radio waves, which hel the boat. The rado-boat was displayed for the first time at an electrical exhibition in 1898. Tesla is now also credited with inventing the modern radio since the Supreme Court over turned Guglielmo Marconi’s patent in 1943 in favour of Nikola Tesla’s earlier patents.
AM Radío


AM rado uses amplitude modulation for rado broadcast. It is a common method of broadcasting The first experimental broadcast with the AM rado R was done in 1906 by a Canadian inventor, Reginald we Fessenden. Commercial radio services on the AM rado began in the 1920s.
FM Radio
FM rado uses frequency modulation for radio broadcast. It was invented by Edwin Howard Armstrong The FM rado is the preferred format for music broadcast.
Guglielmo Marconi


Gugliclmo Marconi is known as the father of radio. He was born in Italy. He was the finst
person to prove the practical use of radio communication. He sent the first radio signals
over a distance of 1.5 km in Bologna in 1895. He established the first radio link between Franoe and Britain and opened the first radio factory in Chelmsford, Essex, in 1899. He successfully made the first trans-Atlantic radio transmission in 1901. Marconi was awarded the Nobel Prize in physics in 1909
Radiotelephone
Rado telephone is a wireless telephone. It allows two or more people to talk using rado. It uses radio waves rather than wires or cables Radiotelephones were available as early as 1919 Radiotelephone.

Uses

Rado waves are used for communication. Rado is a popular means of entertainment. People listen to music and news from around the world on the radio. Rado waves are also used as a means of communication on ships and airplanes. They are an important means of communication for the police, firefighters, and other emergency services The military uses radio waves to communicate between warships, planes, and different base stations. Radar, a form of rado waves, is used to detect and guide ships, planes, and submarines

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