An airtight bottle with a fixed volume contains air. The Sun heats the air in the bottle. What effect does this have on the average speed of the air molecules in the bottle, and on the average separation between them?
- Aaverage speed decreases; average distance decreases
- Baverage speed decreases; average distance stays the same
- Caverage speed increases; average distance increases
- Daverage speed increases; average distance stays the same