Some tiny smoke particles are suspended in a sealed glass cell containing air. A bright beam of light is shone through the cell, and the smoke particles are viewed under a microscope. The smoke particles are observed to move with a rapid, jerky, and random motion.
What name is given to this motion of the smoke particles?
Explain, in terms of air molecules, why the smoke particles behave in this way.
151 exam-style questions on CIE IGCSE Physics 2.1.2a Particle structure and motion in solids, liquids and gases. Each one has a worked solution and a mark scheme showing where the marks go.