If a water wave has a wavelength of 1.0m and a frequency of 2.0Hz, how long will the wave take to travel 20.m from a boat to the shore?
\(t = \dfrac{20m}{c~m/s} = \dfrac{20}{c}s\\ c = \lambda \nu = 1.0m \cdot 2.0s^{-1} = 2m/s\\ \text{You finish}\)
+1438 
