Question

 Which of the following is incorrect about Tyndall effect?

(a) Greater difference in refractive index

(b) Diameter of dispersed particles is less than the wavelength of incident light

(c) Use to differentiate two colloidal solutions

(d) Suspensions show Tyndall effect

Answer 1

(b) Diameter of dispersed particles is less than the wavelength of incident light

The diameter of the dispersed particles is not much smaller than wavelength of the light used. The refractive indices of the dispersed phase and the dispersion medium differ greatly in magnitude.