Question

why must sound travel through a medium
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Answer 1

Sound needs a material medium for their propagation like solid, liquid or gas to travel because the molecules of solid, liquid and gases carry sound waves from one point to another. Sound cannot progress through the vacuum because the vacuum has no molecules which can vibrate and carry the sound waves.

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Answer 2

Answer:

Because Sound is a mechanical wave.

Explanation:

It needs to travel through a medium because sound is nothing but a series of compressions and rarefations which passes sonic energy. That's why to pass it needs a medium to compress and continue it's journey.