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Question

Which of the following led to the discovery of protons?


  1. Cathode rays

  2. Electromagnetic rays

  3. Magnetic rays

  4. Canal rays


Solution

The correct option is D

Canal rays


Eugen Goldstein in 1886 discovered the presence of new radiation in gas discharge tube even before the identification of electrons. He called these rays as Canal Rays. His experiment led to the discovery of protons. 

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