A cork floating on the water’s surface rises and falls as a wave travels over the surface. The diagram shows how the cork’s height above the mean level of the surface changes with time. The numerical value of the wavelength of this wave is the same as the numerical value of the amplitude of this wave. What is the speed of the wave?
- A$1.0\ \text{cm s}^{-1}$
- B$2.0\ \text{cm s}^{-1}$
- C$4.0\ \text{cm s}^{-1}$
- D$8.0\ \text{cm s}^{-1}$