Positive rays give flash on________________?
Correct answer: D. ZnS
- A. AgNO3 plate
- B. AgCl plate
- C. ZnO
- D. ZnS
Explanation
Positive rays produce visible flashes when they strike a fluorescent material such as zinc sulfide, ZnS. ZnS converts the energy of the particles into tiny flashes of light. Students may choose AgCl because it is light-sensitive, but AgCl is not the fluorescent screen normally used in this experiment.
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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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