California Science Test (CAST) 8th Grade Practice Exam

The material through which a wave travels. This can be a solid, liquid, or gas.

Density Analog Medium Digital

Correct Answer:

Medium

Explanation:

A medium is the substance through which a wave travels. Waves carry energy by making the particles of the medium vibrate and pass that motion along from one particle to the next, allowing the wave to move through solids, liquids, or gases. This is why sound can travel through air, water, or metal. Density describes how much mass is in a given volume, not the carrier of the wave, and analog and digital refer to how information is represented rather than what carries a wave.

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