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The term radio It has a wide variety of uses. Originating in Latin radius, the word is used in the geometry to refer to linear segment that joins the center of a circle with its circumference.

The radius, therefore, is the half diameter . In this case, the term is used in the singular and refers to the length of any of the radii of a circle or sphere. If you say, for example, that a circle It has a radius of 5 centimeters, this means that all the radii of this figure share the same extension (5 centimeters).

It is known as radio, on the other hand, at lightning of a wheel . It is each of the bars that rigidly join the central area of ​​the wheel with its edge, which is known as perimeter region or simply perimeter.

In the field of anatomy , the radio is a bone which, next to the ulna, forms the forearm. The radius is shorter than the ulna and, in addition, it is located below it.

Radio can also come from the Latin scientific radium and make reference to radioactive chemical element of atomic number 88 . In this case, it is a metal rare in the earth's crust that is used in the nuclear industry.

Radio, finally, is the colloquial term that makes reference to receiver . This device is used to collect and transform into sound the waves that are emitted by a radio transmitter.

Radio history

Radio is a means of communication which has managed to remain in force for decades despite the emergence of more sophisticated competitors, such as television and digital content in general. Interestingly, the name or nationality of the inventor is not known with certainty: among the potential creators are a Russian, an Italian and a Spanish.

With respect to its operation, this revolutionary device could not exist if James Clerk Maxwell, a physicist originally from Scotland, had not formulated the theory about waves electromagnetic, since this event was followed by the discovery of radio waves, fifteen years later, by the German scientist Heinrich Hertz.

Only in 1894, Nikola Tesla, considered by many the true inventor of the radio, made a public demonstration of a transmission Radio A year later, Guillermo Marconi presented an unprecedented radio system, with which he managed to cross the Atlantic Ocean at the beginning of the 20th century; It is worth mentioning that for his work he used patents that belonged to Tesla, which questioned his authorship on more than one occasion.

Radio as a means of communication and mass entertainment began to exist in 1920 in the United States and Argentina. As in the case of his invention, there are various opinions regarding the order in which the first ones appeared stations.

The first generation of the radio was based on Modulated Amplitude (AM) technology, while in 1933 a system was proposed that relied on the Modulation Frequency (FM), capable of producing higher sound quality and less vulnerable to radio parasites and the interferences. FM radio premiered in the late 1930s, although this did not mean the end for AM.

Finally, it is interesting to note that it is currently possible to listen to the radio through Internet; This entails two fundamental changes with respect to the use of a traditional device: practically any device capable of connecting to the Network can be used, provided it has (or allows the connection of) speakers; There is no need to pick up the signal physically, so all stations in the world can be tuned in from anywhere on the planet.

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