Water waves enter a dock at a rate of 120 crests per minute At the dock are two poles - Science - Sound

Question

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

Jyoti Pant · Accepted Answer

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

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.