Color of the glow produced in the discharge tube:
Correct answer: C. depends on the gas used in the discharge tube
- A. depends on the pressure in the discharge tube
- B. depends on the metal used as cathode
- C. depends on the gas used in the discharge tube
- D. does not depend on the nature of the gas used in the discharge tube
Explanation
In a discharge tube, excited atoms or molecules emit their characteristic colours as they return to lower energy levels. Thus, the gas used, rather than the cathode metal, mainly determines the glow colour.
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