Is the beam of light scattered by particles in a solution?

The volume of a colloidal particle V_c as compared to the volume of a solute particle in a true solution V_s could be

In which of the following substances the light can scatter ? a) Milk b) Starch solution (before particles settled down) c) Starch solution (after particles settled down) d) Water e) Gold f) Oil + Water

Let S_(1) be the amount of Rayleigh scattered light of wavelength lambda_(1)and S_(2) that of light of wavelength lambda_(2) from a particle of size a . Which of the following statement is true?

Explain the phenomenon observed When a beam of light is passed through a colloidal sol.