Practice 192 free Class 9 Science - IS MATTER AROUND US PURE? questions with answers and step-by-step solutions.
Differentiate between homogeneous and heterogeneous mixtures with examples.
$A$ group of students took an old shoe box and covered it with 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 figure. They were amazed to see that the 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.
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