positive rays produces flashes on which plate
Correct answer: D. ZnS
- A. MgO
- B. CuO
- C. Al2O3
- D. ZnS
Explanation
MgO is not commonly used as phosphor materials for producing flashes upon electron impact. CuO is not commonly used as phosphor materials for producing flashes upon electron impact. Al2O3 is not commonly used as phosphor materials for producing flashes upon electron impact. Positive rays produce flashes on the phosphor plate coated with ZnS (zinc sulfide).
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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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