Question

2.) A tsunami is produced by massive and sudden movements of large masses of earth crust under ocean water. Most notably in recent years, a tsunami was produced by a major earthquake very close to the east coast of Japan. The tsunami struck the main islands of Japan with a very short time interval after the earthquake. The tsunami moved radially out from the epicenter of the earthquake in all directions and eventually had reached the west coast of the United States with relatively minor impact. The relationship between the tsunami amplitudes at Japan and the US for this event can be summarized as follows

            a.) the amplitude at Japan was less than the amplitude at the US

            b.) the amplitude at Japan was equal to the amplitude at the US

            c.) the amplitude at Japan was greater than the amplitude at the US

3.) A seismic wave, originating in California, arrives at a seismograph in South America some time later. The seismic wave speed equal 5400 meter/second. The frequency of this wave is 90 Hertz. Determine the wavelength for these waves.

            a.) 40.0 meters

            b.) 50.0 meters

            c.) 60.0 meters

            d.) 25.0 meters

Answer 1

Wavelength = Speed of wave / frequency of wave = 5400 / 90 = 60 meters Answer

Ans (C)