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A sound source was placed in a tumbler. But the sound becomes fainter as we suck air from it. Why?

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The sound we heard was of the air alone.

Glass is a poor conductor of sound.

The sound source is a poor conductor of sound.

Sound needs a medium to travel.

answer is C.

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Detailed Solution

The right answer is " Sound needs a medium to travel". When the air inside the tumbler is sucked out, the medium of propagation disappears.

If all the air in the tumbler is sucked, the sound would stop completely. Because, when air has been removed completely from a vessel, there is a vacuum in the vessel. Sound cannot travel through a vacuum.

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