The proton was discovered through experiments on
Correct answer: B. positive rays produced in a discharge tube with a perforated cathode
- A. cathode rays
- B. positive rays produced in a discharge tube with a perforated cathode
- C. radioactive decay of uranium
- D. the photoelectric effect
Explanation
Goldstein observed rays travelling towards the cathode and passing through holes in it, and the lightest positive particles, obtained when hydrogen filled the tube, were identified as protons. Cathode rays led to the electron instead, which is the pairing this question tests. The charge to mass ratio of these positive rays depended on the gas used, unlike that of cathode rays.
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About Discovery of the Proton
The discovery of the proton follows the study of positive rays, also called canal rays, observed in discharge tubes and later identified as positively charged particles. The work of Goldstein and Rutherford is linked to the proton's charge, relative mass and role in the nuclear model, distinct from the discovery of the electron.
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