Discussion
Sound travels fastest in
Answer: D
Sound travels fastest in steel.
Sound is a mechanical wave and travels faster in media whose particles are more tightly bound. It moves at roughly 5,900 m/s in steel, about 1,500 m/s in water and about 343 m/s in air at room temperature.
In a vacuum there are no particles at all, so sound cannot travel there, which is why vacuum is the trap.
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