On February 22, 1857, the German physicist Heinrich Hertz was born in Hamburg.

On this day (February 22), 1857, the German physicist Heinrich Hertz was born in Hamburg (Germany).
Before the discovery of radio waves, a form of long-distance communication already existed: the wire telegraph. Sea cables were built to connect different continents.
In the 19th century, scientists began to investigate how to send electricity through the air. One of these scientists, Heinrich Hertz , is considered to be the father of telecommunications.
Heinrich Hertz, in 1887, carried out a famous experiment where he managed to transmit electromagnetic waves between an oscillator (emitting antenna) and a resonator (receiving antenna), experimentally confirming the theories of the English physicist James C. Maxwell on the identity of characteristics between light and electromagnetic waves.
With this experiment he will help lay the groundwork for the invention of radio and the revolution of telecommunications.
Faraday theorized about electromagnetic fields and, among them, about electromagnetic fields produced by electric currents. Maxwell put Faraday's theory into mathematical formulas that also predicted that magnetic fields could produce electric currents, and finally Hertz validated Faraday's and Maxwell's theories with his experiments.
Hertz's experiment consisted of using an induction coil, a Rühmkorff spool, straight conductors with spheres at their ends separated by a small space. In these conductors he made an electrical spark jump and this spark was repeated in the receiving conductors.
Hertz showed that these waves were electromagnetic in nature and that their speed was the speed of light.
In his honor the unit of measurement for frequency will be called hertz (Hz) and electromagnetic waves will be called hertzian waves.
As a curiosity to comment that even demonstrating the electromagnetic nature of the waves, Hertz did not believe that this would help the development of telecommunications since he said that the antennas necessary for it should be enormous without taking into account the possible advances in the technology that would allow smaller antennas.
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- son, you have to do your homework
- ok dad, can you help me with physics?
- well, okay
- Let's see, can an electric current cause an electromagnetic field?
- I don't know
- and vice versa?
- don't know
- you don't know if an electromagnetic current can cause an electric current?
- no, I don't know
- well that's a help, do you know anything about Hertz?
- one of those very itchy candies?
- So I can't do my homework
- if you can
- but if you don't help me
- well you wake up that those duties are not mine

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