Given,
The distance between the two docks, d=40.0 m
The wavelength is described as the distance between the two adjacent crests.
Here λ is the wavelength.
From the figure, there are 4 wavelengths between the docks.
Thus the wavelength of the wave is given by,
[tex]\lambda=\frac{d}{4}[/tex]On substituting the known values,
[tex]\begin{gathered} \lambda=\frac{40}{4} \\ =10\text{ m} \end{gathered}[/tex]Thus the wavelength is 10 m
