Question

Which instrument was used for the discovery of the electron?

• A. Plum Pudding Model
• B. Oil Drop Apparatus
• C. Gold Foil Experiment
• D. Alpha Particle Emitter
• E. Cathode Ray Tube

Answer 1

The correct option is E Cathode Ray Tube

J. J. Thomson constructed a glass tube which was partially evacuated i.e. much of the air was pumped out of the tube. Then he applied a high electrical voltage between two electrodes at either end of the tube. He detected that a stream of particle (ray) was coming out from the negatively charged electrode (cathode) to positively charged electrode (anode). This ray is called cathode ray and the whole construction is called cathode ray tube.