A student uses a microscope to observe a suspension of tiny pollen grains in water.
Describe what is observed regarding the appearance and movement of the pollen grains.
Describe the typical path that a single pollen grain takes over a short period of time.
Explain, in terms of molecules, what causes this motion of the pollen grains.
State the name of this type of motion.
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.