Tsunamis are fast-moving waves often generated by underwater earthquakes. in the deep ocean their amplitude is barely noticable, but upon reaching shore, they can rise up to the astonishing height of a six-story building. one tsunami, generated off the aleutian islands in alaska, had a wavelength of 688 km and traveled a distance of 3140 km in 5.85 h. (a) what was the speed (in m/s) of the wave? for reference, the speed of a 747 jetliner is about 250 m/s. find the wave's (b) frequency and (c) period.