Match each feature observed during electrical discharge through a gas with its corresponding pressure stage or physical characteristic.
- Cathode GlowLuminous glow appearing right next to the cathode at around 10 mmHg pressure
- StriationsAlternating bright and dark bands in the positive column at around 1 mmHg pressure
- Crookes Dark SpaceDark region extending to fill most of the tube at very low pressure around 0.01 mmHg
Answer
Cathode Glow matches 'Luminous glow appearing right next to the cathode at around 10 mmHg pressure', Striations match 'Alternating bright and dark bands in the positive column at around 1 mmHg pressure', and Crookes Dark Space matches 'Dark region extending to fill most of the tube at very low pressure around 0.01 mmHg'.
Each feature of gas discharge corresponds to a specific pressure regime inside the discharge tube: Cathode Glow occurs at ~10 mmHg, Striations form at ~1 mmHg in the positive column, and Crookes Dark Space expands to cover most of the tube at ~0.01 mmHg where cathode rays are freely emitted.
Step-by-Step Solution
Key Concept
Stages of electric conduction through gases at reduced pressure.