Jerimiah is studying Wave A and Wave B. Wave A is traveling at 3 hertz, and Wave B is traveling at 1.2 hertz.

When two waves meet, they overlap and produce interference. Their frequencies alone do not show that a crest of Wave A will line up with a trough of Wave B, so choice D is not necessarily true. Refraction involves a wave changing direction as it enters a different medium, and the waves’ frequencies do not simply add to make a 4.2-hertz resulting wave.

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