The right option for the statement "Tyndall effect is exhibited by" is:

Options

A. The refractive indices of the dispersed phase and the dispersion medium differ greatly in magnitude
B. The diameter of the dispersed is much smaller than the wavelength of the light used .
C. During projection of movies in the cinemas hall , Tyndall effect is noticed
D. It is used to distinguish a true solution from a colloidal solution

Answer

B

Explanation

The diameter of the dispersed particles is not much smaller than the wavelength of the light used
The intensity of scattered light depends of the difference between the refractive indice of the D.p and D.M .In lyophobic colloids ,this difference is appreciable and therefore the tyndal effect is quite well defined but in lyophilic sols the difference is very small and the tyndal effect is very weal . So , to show Tyndall effect the refractive indices of the dispersed phase and dispersion medium difffer greatly in magnitude .