Wilhelm Roentgen received the first Nobel Prize in physics in 1901 for his discovery of X-rays in 1895. Roentgen was studying cathode rays (which we now know as electrons.) He had a cathode tube wrapped in black paper and noticed that a nearby screen was fluorescing. Roentgen realized he was seeing some sort of unknown X radiation that could pass through materials that absorb visible light. His discovery revolutionized physics and medicine.

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Slide 21 of 28