PH-442
Brownian motion
Physics · Secondary 3 · Medium · Brownian motion
Smoke particles are observed through a microscope in a smoke cell filled with air. If all the air were removed to create a vacuum, what would happen to the Brownian motion of the smoke particles?
- It would increase because there is no air resistance in a vacuum.
- It would stop because there are no air molecules to hit the smoke particles.
- It would become regular straight‑line motion.
- It would be unchanged because smoke particles move by themselves.
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