A classic experiment to demonstrate Brownian motion involves observing smoke particles suspended in air inside a small glass cell (a smoke cell).
State three essential components of the experimental setup required to perform and observe this demonstration, and briefly describe the function of each.
Describe precisely what is observed when viewing the smoke cell through the microscope.
Explain the cause of these observations in terms of the kinetics and collisions of air molecules.
321 exam-style questions on CIE IGCSE Physics 2.1 Kinetic particle model of matter, covering 2.1.1 States of matter and changes of state, 2.1.2a Particle structure and motion in solids, liquids and gases, 2.1.2b Gas pressure and particle collisions, 2.1.2c Brownian motion, 2.1.3a The absolute scale of temperature, and 2.1.3b Pressure, volume and temperature of a gas. Each one has a worked solution and a mark scheme showing where the marks go.