Pressure in gas discharge tube was kept________________?
Correct answer: D. 0.01 torr
- A. 10 torr
- B. 1 torr
- C. 0.1 torr
- D. 0.01 torr
Explanation
Gas discharge tubes used to study cathode and positive rays were maintained at very low pressure, commonly about 0.01 torr, so that the discharge could pass through the gas. Students may choose 0.1 torr because it is also a low pressure, but it is higher than the standard value usually quoted for 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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