Answer
The collisions of the molecules of the dispersion medium with the small, dispersed colloidal particles cause Brownian motion. Scintillations (flashes of light) are seen when colloids are studied under a microscope. Particles in a solution are too small to be seen under a microscope and do not cause scintillations.
Work Step by Step
The collisions of the molecules of the dispersion medium with the small, dispersed colloidal particles cause Brownian motion. Scintillations (flashes of light) are seen when colloids are studied under a microscope. Particles in a solution are too small to be seen under a microscope and do not cause scintillations.
