While watching ocean waves at the dock of the bay Otis notic

While watching ocean waves at the dock of the bay, Otis notices that 7 waves pass beneath him in 26 seconds. He also notices that the crests of successive waves exactly coincide with the posts that are 3 meters apart. What are the 1. period, 2. frequency, 3. wavelength, 4. speed of the ocean waves?

Solution

8 waves = 8 * wavelength in 26 seconds.. V= 8 * lambda/26 m/s sepearation between crests = wavelength = 2m => V= 8*2/26=0.615 m/s lambda= 2 freqnecy= V/lambda= 0.307 Hz time period = 1/f=3.25s