Typdall effect is used to distinguish between a colloidal solution and a true solution. Zsigmondy `(1903)` used Tyndall effect to set up an apparatus known as

Options

A. ultramicroscope
B. submicroscope
C. paramicroscope
D. tunnelingmicroscope

Answer

A

Explanation

To create an ultramicroscope, an intense beam of light is focussed on the colloidal solution contained in a glass vessel. The focus of the light is then observed with a microscope at right angles to the beam. Individual colloidal microscope at right angles to the bea. Individual colloidal particles appear as bright stars against a dark background. Ultramicroscope does not make the actual colloidal particles visible but only helps us to observe the light scattered by them. Thus, ultramicroscopic does not provide any information about the size and shape of colloidal particles. However, we can count their numbers as we can count the stars in the sky.