Cathode rays were discovered by Julius Plücker and Johann Wilhelm Hittorf. By placing a charge across a glass tube with a vacuum inside and a phosphor coating outside, it was possible to get a bright glow. Electron travels in straight lines and leave shadows. If the cathode rays hit a paddle with a phosphor coating, it would force the paddle to move signifying that cathode rays are particles (1 ene 1803 año – 1 ene 1900 año)
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1 ene 1803 año
1 ene 1900 año
~ 97 years