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Which of the following CANNOT carry sound?

ASteel (solid)
BAir (gas)
CVacuum (no matter)
DWater (liquid)
Answer & Solution
Correct answer: C. Vacuum (no matter)
Sound requires a medium with particles to vibrate. Vacuum has no particles, so sound can't propagate through it. Astronauts in space communicate via radio — electromagnetic waves don't need a medium.
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