Water waves enter a dock at a rate of 120 crests per minute. At the dock are two poles 12m apart from each other. A worker watches a particular wave crest pass from one pole to another in 4s. Find the frequency of wave motion.

Given that the water waves enter a dock at a rate of 120 crests per minute
i.e  Water wave enter a dock at a rate of 120/60=2 crests per second.
So the frequency is 2 Hz.

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