Colour of fluorescene produced by cathode rays depends upon________________?
Correct answer: D. Composition of glass
- A. Temperature
- B. Pressure
- C. Volume
- D. Composition of glass
Explanation
Cathode rays produce fluorescence when they strike the glass, and the colour depends mainly on the composition of the glass or fluorescent material. It is not determined by the temperature, pressure or volume of the discharge tube. Students may choose b because gas pressure affects the appearance of discharge, but it does not determine the fluorescence colour.
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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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