What is a discharged tube ?
How was it used for finding electrons and protons?
Answers
✓A discharged tube is a tube containing charged electrodes and filled with a gas in which ionization is induced by an electric field.
✓The gas molecules emit light as they return to the ground state.
In 1920, Ernest Rutherford postulated that there were neutral, massive particles in the nucleus of atoms. This conclusion arose from the disparity between an element's atomic number (protons = electrons) and its atomic mass (usually in excess of the mass of the known protons present). James Chadwick was assigned the task of tracking down evidence of Rutherford's tightly bound "proton-electron pair" or neutron
On passing high voltage between the electrodes ,it was found that some rays were coming from the side of the anode which passed through the holes in the cathode and produced green fluroscense on the opposite glass wall coated with zinc sulphide. These rays were called anode rays or canal rays or positive rays.
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