Question

When extremely small particles X derived from the anther of a flower were suspended in a liquid Y and observed through a microscope, it was found that the particles X were moving throughout the liquid Y in a very zig-zag way. It was also observed that warmer the liquid Y, faster the particles X moved on its surface.

(a) What could paricles X be ?

(b) What do you think liquid Y is ?

(c) What is the zig-zag movement of X known as ?

(d) What is causing the zig-zag movement of particles X ?

(e) Name the scientist who discoverd this phenomenon.

(f) What does this experiment tell us about the nature of luquid Y?

Answer 1

(a) Pollen Grains.

(b) Water.

(c) Brownian motion.

(d) The fast moving water molecules are constantly hitting particles X causing them to move in a zig-zag path.

(e) Robert Brown.

(f) The liquid Y is made up of extremely small particles which are constantly moving.