50 Hertz
Heinrich Rudolf Hertz
February 22, 1857 – January 1, 1894
Heinrich Rudolf Hertz
was a German physicist who clarified and expanded the
electromagnetic theory of light that had been put forth by
Maxwell. He was the first to satisfactorily demonstrate the
existence of electromagnetic waves (radio waves).
In more advanced experiments, Hertz measured the velocity of
electromagnetic radiation and found it to be the same as the
light’s velocity. He also showed that the nature of radio
waves’ reflection and refraction was the same as those of
light.
Hertz's experiments would soon trigger the invention of the
wireless telegraph, radio, and later television. In
recognition of his work, the unit of frequency - one cycle per
second - is named the "Hertz".
The hertz (symbol Hz) is the SI unit of frequency defined as
the number of cycles per second of a periodic phenomenon. One
of its most common uses is the description of the sine wave,
particularly those used in radio and audio applications.
In the UK our mains electricity has a frequency of 50 Hertz !
If you ever wondered what it meant when you see "50 Hz" marked
on something electrical, now you know.
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