Physics
posted by Josh .
A student reading his physics book on a lake dock notices that the distance between two incoming wave crests is about 0.65 m, and he then measures the time of arrival between the crests to be 1.8 s. What is the approximate speed of the waves?

frequency*wavelength= wavlength/period=speed
solve for speed. 
So would that just be .65/1.8 and the answer is 0.36?

wave crest/time interval=speed
(.65m)/(1.6s)=0.36m/s
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