What describes sound propagation through a vacuum?

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Multiple Choice

What describes sound propagation through a vacuum?

Explanation:
Sound is a mechanical wave that needs particles to carry the vibration. A vacuum has no matter, so there are no particles to compress and rarefy, and the pressure variations that we recognize as sound cannot propagate. That’s why sound cannot travel in a vacuum. The other ideas don’t fit because sound in gases is a longitudinal wave that relies on a medium, the speed of sound isn’t a universal constant like the speed of light, and without a medium there’s simply nothing to carry the wave.

Sound is a mechanical wave that needs particles to carry the vibration. A vacuum has no matter, so there are no particles to compress and rarefy, and the pressure variations that we recognize as sound cannot propagate. That’s why sound cannot travel in a vacuum. The other ideas don’t fit because sound in gases is a longitudinal wave that relies on a medium, the speed of sound isn’t a universal constant like the speed of light, and without a medium there’s simply nothing to carry the wave.

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