Question : In which year did Henri Becquerel discover that uranium salts emit penetrating radiation that can be registered on a photographic plate?
Option 1: 1892
Option 2: 1894
Option 3: 1896
Option 4: 1898
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Correct Answer: 1896
Solution : The correct answer is 1896.
In 1896, Henri Becquerel discovered that uranium salts emit penetrating radiation that can be registered on a photographic plate. He investigated the newly discovered X-rays. In 1896, which led to the study of how uranium salts were affected by light, he accidentally discovered that uranium salts spontaneously emit penetrating radiation that can be registered on a photographic plate.
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