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In the bell jar experiment, the sound gradually grew fainter after the vacuum pump was turned on until we could only hear a feeble sound. Why?

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The bell do not produce such strong sound as it was producing earlier.

The medium is sucked by the pump

The Vacuum pump absorbs the sound

The bell jar behaves as isolated medium

answer is B.

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Detailed Solution

In the bell jar experiment, the sound gradually grew fainter after the vacuum pump was turned on until we could only hear a feeble sound. Because the medium is sucked by the pump

Sound always travels in a medium

The air is pumped out by the vacuum pump, and thus there is no medium in the jar and so the sounds get fainter.

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