Brody and Ethel are arguing about waves. Brody says that waving his hand back and forth is a scientific wave. Ethel says that it is not. Which statement best describes who is correct?

A scientific wave is a disturbance that transfers energy from one place to another. Brody’s hand moves back and forth, but that motion does not carry energy along from one location to another, so Ethel is correct. The motion does repeat, but a repeating pattern alone does not make it a wave.

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