A-LevelPhysicsIdeal gases9702/12 · Oct/Nov 2011 · Q191 Mark
In an experiment to demonstrate Brownian motion, smoke particles in a container are illuminated by a strong light source and observed through a microscope. The particles are seen as small specks of light that are in motion. What causes the Brownian motion?
Acollisions between the smoke particles and air molecules
Bcollisions between the smoke particles and the walls of the container
Cconvection currents within the air as it is warmed by the light source
Dkinetic energy gained by the smoke particles on absorption of light
✓ Correct answer
A: collisions between the smoke particles and air molecules
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