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How Sound Propagates!

In the bell j...

Question

In the bell jar experiment, after vacuum pump is started

A

the sound of the bell disappears suddenly

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B

the sound becomes fainter gradually

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C

the sound is heard with the same loudness

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D

unpredictable

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Solution

The correct option is C the sound becomes fainter gradually
The vacuum gradually pump out the air so the sound become fainter and ultimately when less air is left a very feeble sound is heard.

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Q. In the bell jar experiment, after starting the vacuum pump the sound gradually become fainter and finally we hear a feeble sound. Why?

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Figure

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