"Kirchhoff." YourDictionary, n.d. Web. 18 April 2019. <https://www.yourdictionary.com/kirchhoff>.
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Gustav Robert 1824–1887
German chemist who with Robert Bunsen discovered the elements cesium and rubidium. He also investigated the solar spectrum and researched electrical circuits and the flow of currents. His electromagnetic theory of diffraction is still the most commonly used in optics.