O-LevelPhysicsThermal Physics5054/11 · Oct/Nov 2020 · Q251 Mark
A smoke particle Z is seen to move randomly when suspended in air as illustrated. Which statement explains why Z moves randomly?
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
AAir molecules are much larger than Z.
BAir molecules are smaller than Z.
CAir molecules hit Z from different directions.
DAir molecules vibrate about a fixed position.
✓ Correct answer
C: Air molecules hit Z from different directions.
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