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A Century-Old Question: Does a Crookes Paddle Wheel Cathode Ray Tube Demonstrate That Electrons Carry Momentum?
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Humphrey, T. E.; Calisa, Vaishnavi – Physics Teacher, 2014
In 1879, in the midst of the debate between English and continental scientists about the nature of cathode rays, William Crookes conducted an experiment in which a small mill or "paddle wheel" was pushed along tracks inside a cathode ray tube (CRT) (similar to that shown in Fig. 1) when connected to a high-voltage induction coil. Crookes…
Descriptors: Demonstrations (Educational), Motion, Scientific Concepts, Mechanics (Physics)