Explain the expiriment to prove 'sound needs medium for propagation'
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Answers
Answer:
Sound needs a material medium for their propagation like solid, liquid or gas to travel because the molecules of solid, liquid and gases carry sound waves from one point to another. Sound cannot progress through the vacuum because the vacuum has no molecules which can vibrate and carry the sound waves.
The experiment
Take a bell jar. Bell jar is a laboratory equipment used for creating a vacuum. Its shape is similar to that of a bell.
Place an electric bell in the bell jar.
Start pumping out the air of the sealed bell jar. As we start pumping out the air, the sound of an electric bell coming out of the bell jar starts fading.
As soon as the vacuum is achieved in the bell jar, no more sound will be audible from the bell jar. However, in the bell jar, the hammer continues to hit the gong.
This means that still the sound is being produced but now we cannot hear it. This is because sound waves always need a medium to propagate. In the bell jar, it was, hence sound waves cannot travel.
