Extended tier only In an experiment to determine the nature of liquids, some very tiny…
Physics · IGCSE · Cambridge (CIE) — Thermal physics
Extended tier only
In an experiment to determine the nature of liquids, some very tiny pollen grains are suspended in water. They are illuminated by a bright light, and observed under a microscope.
The view through the microscope is of small, bright dots, which move about at random, rapidly and they frequently change direction.
Which of the following would be the correct explanation for the observation through the microscope?
The bright dots are water molecules, being hit by other water molecules.
The bright dots are water molecules, which are vibrating due to their thermal kinetic energy.
The bright dots are pollen grains, which are being hit many times per second by water molecules.
The bright dots are pollen grains, which are vibrating due to their thermal kinetic energy.
Answer
(C) The bright dots are pollen grains, which are being hit many times per second by water molecules.
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