Paul Langevin, French physicist

Paul Langevin, French physicist

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Credit: EMILIO SEGRE VISUAL ARCHIVES/AMERICAN INSTITUTE OF PHYSICS/SCIENCE PHOTO LIBRARY

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Caption: Paul Langevin (1872-1946), French physicist. Langevin's main work was in the field of paramagnetism, which is the mild attraction of materials to magnetic fields. He deduced a formula correlating paramagnetism with absolute temperature. During the First World War he worked on the use of ultrasonic waves in submarine detection, research which would later culminate in the development of sonar.

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