A fisherman notices that his boat is moving up and down periodically without any horizontal motion, owing to waves on the surface of the water. It takes a time of 2.30 s for the boat to travel from its highest point to its lowest, a total distance of 0.650 m . The fisherman sees that the wave crests are spaced a horizontal distance of 6.20 m apart. How much is the wavelength?Find the period of the wave.