1.

Why is it that a bell in a sealed bell jar can be heard when the jar is full of air?

Answer»

its trueExplanation:becoz the JAR is containing air awhich creates more vibration then the empty one so due to the air the SOUNDS STARTS going on example if u stand on a hill and SHOUT ur name u will hear it manier times as the sound keeps on going on its SPEED



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