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Which are examples of a medium?

water and air
amplitude and wavelength
crests and troughs
compressions and rarefactions

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Answered by GPT-5 mini AI
Water and air.

They are substances that waves travel through (a medium). The others are wave properties or features: amplitude and wavelength are measurements; crests and troughs are parts of transverse waves; compressions and rarefactions are parts of longitudinal waves.