PH-1708
Brownian motion
Physics · Secondary 4 · Medium · Brownian motion
Pollen grains suspended in water are observed under a microscope to move in a jerky, random way. What does this observation show about the water molecules?
- Water molecules are moving randomly all the time.
- Water molecules are fixed but the pollen grains vibrate.
- Water molecules move only when light shines on them.
- Water molecules move in circles around each pollen grain.
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