This is the activity of Class 10 Physics: Conduct an experiment to demonstrate the scattering of the light

What is Scattering of Light:

Atoms or molecules which are exposed to light absorb light energy and emit some part of the light energy in different directions. This is the basic process that happens in the Scattering of light.

Experiment to Understand the Scattering of Light

Let’s demonstrate an experiment to understand the scattering of light.

1. Take a solution of sodium-thio-sulfate (hypo) and sulphuric acid in a glass beaker.

2. Place the beaker in an open place where abundant sunlight is available.

3. Watch the formation of grains of sulphur and observe changes in the beaker

4. You will notice that sulphur precipitates as the reaction is in progress

Changes in size and Colour of Sulphur grain

5. At the beginning, the grains of sulphur are smaller in size and as the reaction progresses, their size increases due to precipitation

6. Sulphur grains appear blue in colour at the beginning and slowly their colour becomes white as their size increases.

7. The reason for this is the Scattering of light.

Reason of Sulphur Grains Blue Colour

In the beginning, the size of grains is small and almost comparable to the wavelength of blue light. Hence they appear blue in the beginning.

Reason of Sulphur Grains White Colour

As the size of grains increases, their size becomes comparable to wavelengths of other colours.

As a result, they act as scattering centres for other colours. The combination of all these colours appears as White.

This activity has been taken from the class 10th Physics textbook.

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