Question

Q11. A group of students took an old shoe box and 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 in it and
made another hole on the other side to view the light. They placed a milk sample contained
in a beaker/tumbler in the box as shown in the given 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. same results were observed with a salt solution explain​

Answer 1

QUESTION:A group of students took an old shoe box and 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 in it and made another hole on the other side to view the light. They placed a milk sample contained in a beaker/tumbler in the box as shown in the Fig.2.4. 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? (a) Explain why the milk sample was illuminated. Name the phenomenon involved. (b) Same results were not observed with a salt solution. Explain. (c) Can you suggest two more solutions which would show the same effect as shown by the milk solution?

ANSWER: (a) Milk is a colloid and would show Tyndall effect. (b) Salt solution is a true solution and would not scatter light. (c) Detergent solution, sulphur solution.

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