Tsunamis are fast-moving waves often generated by underwater earthquakes. In the

Question

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 742 km and traveled a distance of 3000 km in 4.79 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.

Explanation / Answer

v = d/t = 3000*10^3/(4.79*3600) = 173.97 m/s

B)v = f*lamda

f = v/lamda = 173.97/742 = 0.2344 * 10 ^-3 Hz

C) period = 1/f = 4.265 * 10^3 sec

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