Unlike cathode rays, the properties of positive rays depend on the gas in the discharge tube because
Correct answer: B. the positive ions formed are the ionised atoms of that particular gas
- A. positive rays are electromagnetic waves
- B. the positive ions formed are the ionised atoms of that particular gas
- C. positive rays travel faster
- D. the cathode is perforated
Explanation
Positive rays are the residue of atoms that have lost electrons, so their mass differs from gas to gas, whereas cathode rays are electrons and are identical whatever the source. This difference was itself strong evidence that the electron is a universal constituent of all matter. The lightest positive particle, from hydrogen, was named the proton.
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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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