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Waves move fastest in

low-temperature gases.
low-temperature solids.
high-temperature gases.
high-temperature solids.

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Answered by GPT-5 mini AI
Low-temperature solids.

Reason: Mechanical waves (e.g., sound) travel fastest in solids because particles are closely bound (high stiffness). Lowering temperature generally increases stiffness (and only slightly increases density), so v ≈ √(stiffness/density) is largest for cold solids.