Describe a simple experiment to show that sound cannot propagate through vacuum.

We can consider a simple experiment in which we an electric bell in a closed glass jar. We connect the jar to an air pump which can suction out all the air from inside the glass chamber. In the beginning, we can hear the sound of the bell ringing but as air is slowly sucked out the sound gets lower. Once all the air is sucked out, a vacuum is created and the sound of the bell can no longer be heard.

Thus, we have proved that sound does not travel through vacuum.

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We can show the bell jar which there is a jar and within that there is a gong and there is a electric circuit..and a vacuum pipe is also fitted..when we close the circuit the gong start making sound but when we switch on the vacuum pipe ..the sound gets minimised..and after some time no sound is heard
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