Rafael models a longitudinal wave using a coiled-spring toy. If he wants to model a longitudinal wave that carries more energy, how should he move the end of the spring?

A longitudinal wave moves particles parallel to the direction the wave travels, so Rafael should move the spring’s end forward and back along the spring. Larger motions create a wave with greater amplitude, which carries more energy. Therefore, he should use larger forward-and-back motions.

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