(See The Wide World of Fluids article titled "Tsunami, the Nonstorm Wave,". Often when an earthquake shifts a segment of the ocean floor, a relatively small-amplitude wave of very long wavelength is produced. Such waves go unnoticed as they move across the open ocean; only when they approach the shore do they become dangerous (e.g., a tsunami). Determine the wave speed if the wavelength, \(\lambda\), is \(6000 \mathrm{ft}\) and the ocean depth is \(15,000 \mathrm{ft}\).