PH-441
Brownian motion
Physics · Secondary 3 · Hard · Brownian motion
A student observes pollen grains in water under a microscope. She then gently warms the water and sees that the pollen grains move more quickly in random directions. Which statement best explains this change, in terms of Brownian motion?
- The pollen grains gain charge and are pushed apart by electrical forces.
- The pollen grains become lighter so they float faster to the surface.
- Water molecules move faster and hit the pollen grains more often and harder.
- The microscope makes the motion look larger even though it is unchanged.
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