If you slosh the water in a bathtub at the correct frequency, the water rises first at one end and then at the other. Suppose you can make a standing wave in a 145 cm long tub with a frequency of 0.31 Hz. What is the velocity of the water wave?
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That depends upon how many nodes are in the standing wave. If there is one in the middle, than the wavelength is 290 cm. Multiply that by the frequency for the wave velocity.
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