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A longitudinal wave is observed. Exactly 6 crests are observed
to move past a given point in 9.1 s. Its wavelength is 2.4 m and
its frequency is 0.66 HZ. What is the speed of the wave?
The speed of the wave is 1.58 meters per second (or 1.584 if you don’t round it). You multiply wavelength by frequency to get the speed of a wave. 2.4 times 0.66 = 1.548 meters per second.
If you didn’t have the frequency before hand, you would just divide the 6 crests by the 9.1 seconds.
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