Question

On passing a beam of light through the colloidal solution of starch in water, it:

• A. Just pass through the colloidal solution
• B. Gets scattered through the colloidal solution
• C. Get absorbed in the colloidal solution
• D. Get absorbed on colloidal particles

Answer 1

The correct option is B

Gets scattered through the colloidal solution

An explanation for the correct option:
(B) Gets scattered through the colloidal solution

• When a beam of light passed through the colloidal solution it gets scattered this is known as the Tyndall effect.
• Tyndall effect: If a beam of light is passed through a colloid the light is scattered by the larger colloidal particles and the beam of light becomes visible. This effect is known as the Tyndall effect.
• Example: smoke or dust in a room, which makes visible a light beam entering a window.

An explanation for the incorrect options:
(A) Just pass through the colloidal solution

• When a beam of light passed through the colloidal solution it gets scattered.

(C) get absorbed in the colloidal solution

• When a beam of light passed through the colloidal solution, it does not get absorbed by the solution.

(D) get absorbed on colloidal particles

• A beam of light does not get absorbed on colloidal particles. Since it gets scattered.

Hence, option (B) is correct.