Definition
Henri Becquerel (1852โ1908) was a French physicist who discovered radioactivity in 1896. ๐ซ๐ท He found that uranium salts spontaneously emit radiation. This discovery revolutionized physics and led to the development of nuclear science. He shared the 1903 Nobel Prize in Physics with Marie and Pierre Curie for his work on radioactivity. He accidentally left uranium near photographic plates and noticed they were exposed even without light. ๐ก