Multiple choice

In 1869, J.J. Thomson discovered electron. Which of the following was/were used in his experiment?

  1. Paraffin

  2. Alpha particles

  3. Canal rays

  4. Cathode rays
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

J.J. Thomson used cathode rays in his experiment. Rays attracted a positively charged plate kept over the cathode ray tube. It made him infer that the rays are made up of negatively charged particles, which were later called electrons.

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