Question

(a) Write an activity for observing scattering of light in colloidal solutions​

Answer 1

Answer:

ACTIVITY :

• Place a source of light S such as an electric bulb at the focus of a converging lens. This lens provide a parallel bream of light.
• Allow the parallel light beam to pass through a transparent glass beaker B of capacity 500 mL filled with water.
• After passing through the beaker containing 400mL of water allow the light beam to pass through a circular hole made in a cardboard C. Obtain a sharp image of the hole on a screen MN using another convex lens.
• Dissolve about 200 g of sodium thiosulphate (hypo) in water taken in beaker B. Add about 1 to 2 mL of concentrated Sulphuric Acid with help of an injection syringe drop wise in the beaker containing hypo solution.

• what do you observe?
• You will notice fine microscopic sulphur particles precipitating in about 2 to 3 seconds. As the sulphur particles began to form, you can observe the blue light from the sides of the beaker. This is due to scattering of short wavelengths by minute collidial sulphur particles. Observe the color of light patch on the screen. It is interesting to observe the change in color of patch - from orange red colour in the beginning to bright crimson red colour later on the screen.

This activity demonstrates the scattering phenomena of light that helps us to understand the bluish color of sky in general and reddish appearance of the sun at the sunrise or the sunset.

Answer 2

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