explain sound propagation devise an expt to show sound needs medium to travel experiment plz. plz
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Bell-jar experiment demonstrates that sound needs a medium for its propagation. Take an electric bell and an airtight glass bell jar connected to a vacuum pump. Suspend the bell inside the jar, and press the switch of the bell. ... The sound of the bell will become fainter, and after some time, the sound will not be heard.12-Dec-2020
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