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1857: Heinrich Hertz born  
At 6075 kilohertz, electrical waves spread with a little more than six million oscillations per second. The oscillation frequency unit was determined internationally in 1933: A hertz, that is one oscillation per second, was named after Heinrich Hertz who was born 143 years previously, on 22 February 1857 in Hamburg.

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22.2.2020 Hanau protests against right-wing extremism and racism after xenophobic terror attack
About 3,000 people have taken to the streets, calling on the German government to take action against growing right-wing radicalism. Protesters carried placards criticizing the AfD's normalization of racist rhetoric.
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What context is inventor Heinrich Hertz' name used in?
  A term used in acoustics
  A term used for electrical voltage
  A term used for radio and electrical frequencies
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