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Question

In the bell jar experiment, after starting the vacuum pump the sound gradually become fainter and finally we hear a feeble sound. Why?
  1. The medium is sucked by the pump
  2. The bell jar behaves as isolated medium
  3. The bell do not produce such strong sound as it was producing earlier.
  4. The Vacuum pump absorbs the sound

A
The medium is sucked by the pump
B
The bell do not produce such strong sound as it was producing earlier.
C
The bell jar behaves as isolated medium
D
The Vacuum pump absorbs the sound
Solution
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Sound needs a medium to travel. The vacuum pump pumps out the air, and thus the medium through which the sound travels is pumped out and so the sounds get fainter.

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