The sound of an electricity bell dies down slowly when air is slowly pumped out from a bottle because
the wavelength of sound becomes greater in the bottle
sound cannot pass through the bottle
sound needs a material medium
sound can pass through a vacuum
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It's correct because air serves as a material medium for the sound to be transported
The correct answer is C. sound needs a material medium.
Sound is a mechanical wave, and it requires a medium (such as air, water, or solids) to propagate. When air is pumped out of the bottle, the medium for sound transmission becomes less dense, and the sound waves can no longer travel effectively. As the air is removed, the sound gradually dies down because there is less air to carry the sound waves. In a vacuum (with no air), sound cannot travel at all.
