In the 1880s Heinrich Hertz discovered that a spark jumping between two pieces of metal emits a flash of light—rapidly oscillating electromagnetic waves—which can be picked up by an antenna. To honor his groundbreaking work, the unit of frequency was named 'Hertz' in 1930.
Physicists reach atomic-scale telegraphy with light retrieved 8 May 2024 from https://phys.org/news/2024-05-physicists-atomic-scale-telegraphy.html
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