Posted by Danny on Saturday, November 7, 2009 at 10:40pm.
Without the figure, or a description of it, we can't help you. Use the figure to determine the wavelength. It will be twice the distance between two nodes (zeroes) of the standing wave pattern. Then use
(frequency) * (wavelength) = (wave speed) to get the frequency.
there are 6 nodes in the diagram
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