Speed of sound in different media
In which medium does sound travel fastest?
Answer A: explanation for every choice
A
Correct. Sound speed depends on stiffness relative to density, and stiff solids carry sound fastest (about 5,000 m/s in steel).
B
Water carries sound at about 1,500 m/s, faster than air but slower than steel.
C
Air carries sound at about 343 m/s.
D
Sound needs a medium and can't travel through a vacuum.
TakeawaySound: solids > liquids > gases, and none in a vacuum.
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Reviewed 2026-11-05 by a medical student. Spot an error? Report it with question ID cp84.