Physical Science : About the Discovery of Radioactivity
Marie & Pierre Curie, Henri Becquerel. The Discovery of Radioactivity and Radioactive Elements.
French physicist Henri Becquerel accidentally put a wrapped photographic plate in a closed desk drawer with a piece of uranium on top. It remained there several days. When Becquerel later developed the photographic plate, he found an image of the uranium piece. He realized that uranium generates some kind of radiation.
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