We are not able to listen the sound if bell placed in completely empty bell jar.
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It is so because sound needs a material medium to propagate. If jar is empty this means vaccum is in jar so no sound can be he
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According to the data mentioned in the question that,
We are not able to listen the sound if bell placed in completely empty bell jar.
Because,the sound waves need a medium for propagation and for traveling from one place to another.
But,the empty bell jar has no medium for the sound wave propagation, that's why we are not able to hear anything.
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