Class 7| Scattering Of Light | Science | English Medium | Maharashtra Board | Home Revise

Summary

This experiment demonstrates the scattering of light using a laser beam. The process begins with shining a laser through clear water, where the beam is not visible. When milk is added to the water, it becomes slightly turbid, and the laser beam becomes visible due to the scattering of light by the milk particles. The scattered rays are visible to the eye, showcasing how light interacts with tiny particles suspended in a medium, providing a simple and engaging way to understand the concept of light scattering.

Takeaways

• 😀 The experiment demonstrates the scattering of light by small particles in water.
• 😀 A laser pointer or diode laser is used to observe the behavior of light in different solutions.
• 😀 Clear water initially does not show the laser beam because the light passes through without scattering.
• 😀 Adding milk to the water makes it slightly turbid, causing the laser beam to become visible.
• 😀 The milk particles in the water scatter the laser light, which is then visible to the human eye.
• 😀 Scattering occurs when light interacts with tiny particles suspended in the water.
• 😀 The phenomenon of scattering can be observed more clearly in turbid water than in clear water.
• 😀 The experiment requires minimal apparatus: a glass beaker, water, milk, a laser pointer, and a dropper.
• 😀 The scattering of light is a key concept in understanding how light behaves in various mediums.
• 😀 The experiment should be conducted under the supervision of a teacher for safety reasons.

Q & A

What is the main objective of the experiment described in the transcript?

The main objective of the experiment is to demonstrate the scattering of light through a medium with tiny particles, using water and milk to observe how light behaves when it interacts with such particles.

What apparatus is required to perform the experiment?

The required apparatus includes a glass beaker, a diode laser (or laser pointer), clear water, milk (or milk powder), a spoon, and a dropper.

How do you prepare the solution for the scattering experiment?

First, fill a glass beaker with clear water. Then, add a few drops of milk to the water and stir it to make the water slightly turbid.

What happens when the laser beam is passed through clear water?

When the laser beam is passed through clear water, the beam is not visible because there are no particles in the water to scatter the light.

What is the effect of adding milk to the water in the experiment?

Adding milk to the water makes the solution slightly turbid, which allows the laser beam to become visible due to the scattering of light by the milk particles.

Why does the light beam become visible after adding milk to the water?

The light beam becomes visible because the milk particles in the water scatter the light, and the scattered rays enter the eyes, making the beam perceptible.

What phenomenon does this experiment demonstrate?

This experiment demonstrates the scattering of light, showing how light interacts with tiny particles suspended in a medium.

What is the role of the milk particles in the scattering of light?

The milk particles serve as the scattering medium, interacting with the light and causing it to scatter in various directions, making the beam visible.

Why is the light beam not visible in clear water?

In clear water, there are no particles to scatter the light, so the beam is not visible to the human eye.

What does the experiment reveal about the nature of light?

The experiment reveals that light can be scattered when it encounters small particles, which allows it to be seen even in a previously clear medium.