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Nishu Sharma
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Posted 4 year ago
Nishu Sharma 
Why can't the sound waves travel in vacuum? Why do they always need medium?
2 Answer(s)
pradeep negi
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Posted 4 year ago pradeep negi

Sound waves are travelling vibrations of particles in media such as air, water or metal. So it stands to reason that they cannot travel through empty space, where there are no atoms or molecules to vibrate.
Mitesh Sharma
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Posted 4 year ago Mitesh Sharma

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.