A popular demonstration of kinetic theory is to view smoke particles through a…
Physics · IGCSE · Cambridge (CIE) — Thermal physics
A popular demonstration of kinetic theory is to view smoke particles through a microscope, while illuminating them with a bright light.
The diagram shows the view of the smoke particles through a microscope. They are moving about randomly.
What causes the motion of the smoke particles?
The smoke particles are attracted to each other.
The smoke particles vibrate because they are warm.
Smaller air particles are colliding with the smoke particles.
The microscope is vibrating slightly, making the smoke particles appear to move.
Answer
(C) Smaller air particles are colliding with the smoke particles.
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