A wave has a frequency of 23.0 Hz and a wavelength of 14.9 m. What is the velocity of the wave?

Use the wave-speed relationship: velocity = frequency × wavelength. Substituting the values gives 23.0 Hz × 14.9 m = 342.7 m/s, which rounds to 343 m/s. Therefore, the wave’s velocity is 343 m/s, choice D.

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