a) A group of students took an old shoe boxand covered it with a black paper from all sides. They fixed a source of light (a torch) at one end of the box by making a hole init and made another hole on the other side to view the light. They placed a milk samplecontained in a beaker/tumbler in thebox as shown in the figure. They were amazed to see that milk taken in the tumbler was illuminated. They tried the same activity by taking a salt solution but found that light simply passed through it.
(i) Explain why the milk sample was illuminated. Name the phenomenon involved
(ii) Can you suggest two more solutions which would show the same effect as shownby the milk solution?
(iii) Same results were not observed with a salt solution. Explain.
b) Calculate the mass of water and glucose required to make 250 g of 40% solution of glucose.
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Since milk is a colloid and when light is scattered from the particles of colloids it is illuminated and it is because of Tyndall effect. In the tyndall effect light is scattered by particles in a colloid or particles in a fine suspension while showing no light in a true solution.It is used to determine whether a mixture is true or colloidal.
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