A student releases tiny pollen grains into a container of water and observes their movement under a microscope. Each pollen grain is seen to move in a highly irregular, random zigzag path.
State the term used to describe this random, zigzag motion.
Explain, in terms of the molecules of water, what causes this motion of the pollen grains.
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.