Question

Explain Bell jar experiment

Answer 1

The experiment is done by placing an electrical bell in the bell jar. As the air is pumped out of the sealed bell jar, the sound from the bell jar fades. At a particular vacuum, no more sound is heard from the bell, but we can see that the hammer continues hitting the gong and sound is produced. However, the sound is not audible to our ears because of the vacuum inside the jar. This demonstrates that the sound wave cannot travel through vacuum. That is, a sound wave needs a material medium for its propagation. 

Answer 2

Explanation:

Aim :

To show that Sound cannot travel through vacuum.

Materials Required :

A bell jar, electric bell, cotton thread or rubber band, a cork.

method:

Take the bell jar, Suspend an electric bell inside it with the help of a cotton thread or rubber band through an air tight cork .Connect a vacuum pump through another opening in the jar. . Now press the switch. The bell starts ringing and you can hear its sound clearly. Now, pump out the air from the bell jar gradually by switching on the vacuum pump attached in it.

Observation :  You will notice as more and more air is removed from the bell jar, the sound of the bell becomes fainter and fainter. and when a vacuum is created , no sounds is heard.

Conclusion : Sound cannot travel through vacuum, it always need a medium to propagate.

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