Voices of swimmers at a pool travel 400 m/s through the air and 1,600 m/s underwater. The wavelength changes from 2 m in the air to 8 m underwater. How has the change in media affected the frequency of the wave?

Use the wave relationship frequency = speed ÷ wavelength. In air, the frequency is 400 m/s ÷ 2 m = 200 Hz; underwater, it is 1,600 m/s ÷ 8 m = 200 Hz. The frequency stayed the same, so the correct choice is “It stayed the same.”

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