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it can proven by bell jar explanation
appratus - bell jar, electric bell , vaccum pump
procedure - 1. attach the electric bell inside the bell jar
2. start ringing the bell and you will hear it
3. now attach the vaacuum pump and start removing air from the bell jar slowly . Dont stop ringing the electric bell while removing the air .
4. You will observe that the voice of bell becomes feeble and feeble and at some point it will stop ringing
observation until there was air in the bell the bell was audible
after it stopped ringing hence it proves sond needs a material medium for prpogation
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