Smoke particles are observed through a microscope. The smoke particles are seen to move…
Physics · IGCSE · Cambridge (CIE) — Thermal physics
Smoke particles are observed through a microscope. The smoke particles are seen to move in random, rapid motion.
What causes the smoke particles to move in this way?
Air currents push the smoke particles in different directions.
The smoke particles collide with each other and change direction.
The smoke particles are hit by fast-moving air molecules that cannot be seen.
The smoke particles are repelled by electric charges on the glass walls.
Answer
(C) The smoke particles are hit by fast-moving air molecules that cannot be seen.
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