Understanding Brownian Motion

Who was the scientist that first observed the random motion of pollen grains in water?

• Niels Bohr

• Robert Brown

• Isaac Newton

• Albert Einstein

What causes the random motion of pollen grains in water?

• Collisions with water particles

• Magnetic fields

• Wind currents

• Gravitational forces

Which of the following is an example of Brownian motion?

• A car driving on a highway

• Smoke particles moving in air

• A pendulum swinging

• Movement of planets in space

In the context of Brownian motion, what do the particles of the medium refer to?

• The microscope lens

• The pollen grains

• The container holding the liquid

• The water or air particles

Why can't we say that pollen grains collide with each other in Brownian motion?

• Because they are stationary

• Because only one pollen grain is used

• Because they dissolve in water

• Because they are too large