query: Who discovered electromagnetic radiation?
passage: Heinrich Hertz
Heinrich Rudolf Hertz (/hɜːrts/; German:[ˈhaɪ̯nʁɪç ˈhɛɐ̯ts];[1][2] 22 February 1857– 1 January 1894) was a German physicist who first conclusively proved the existence of the electromagnetic waves theorized by James Clerk Maxwell's electromagnetic theory of light. The unit of frequency–cycle per second–was named the "hertz" in his honor.[3]
passage: Heinrich Hertz
Lists and histories Fraunhofer Institute for Telecommunications, Heinrich Hertz Institute History of radio Invention of radio List of people on stamps of Germany List of physicists Outline of physics Timeline of mechanics and physics Electromagnetism timeline Wireless telegraphy Electromagnetic radiation Microwave Other List of German inventors and discoverers