"Heinrich Rudolf Hertz (/hɜːrts/; German: [ˈhaɪ̯nʁɪç ˈhɛɐ̯ts]; 22 February 1857 – 1 January 1894) was a German physicist who first conclusively proved the existence of the electromagnetic waves ...
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predicted by James Clerk Maxwell´s equations of electromagnetism. The unit of frequency, cycle per second, was named the "Hertz" in his honor." - (en.wikipedia.org 31.01.2020)