to prove that sound needs a medium to travel suggest an activity (preferably that can be performed at home )
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The sound of the bell will become fainter and after some time, the sound will not be heard. This is so because almost all air has been pumped out. This shows that sound needs a material medium to travel.
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Answer:The bell jar experiment is a common experiment used to demonstrate that sound needs a medium to travel. ... A bell jar is placed on a base which is vented to a hose fitting that can be connected via a hose to a vacuum pump. By pumping the air out of the bell jar, the air pressure inside the jar can be varied.
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