Why the sound becomes fainter when we place a sound source inside a glass tumbler and suck air from it?

Sound needs a medium to travel

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Sound does not needs a medium to travel

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Glass is a poor conductor of heat and electricity

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None of these

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Solution

The correct option is C Sound needs a medium to travel
The sound needs a medium to travel so, as soon as the air in the glass is removed sound has no medium to travel. It may travel through the floor on which the source is kept in so only a fainter amount may be heard so, the sound becomes fainter as air is sucked out.

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Similar questions

The correct statement is :

(a) Sound and light both require medium for propagation

(b) Sound can travel in vacuum, but light can not

(d) Sound and light both can travel in vacuum.

Statement 1: Sound needs a medium for its propagation.
Statement 2: Sound does not propagate in a vacuum, as it does not have particles to vibrate.

Sound wave is a mechanical wave, which means, unlike light, it needs a medium to travel.

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