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An earthquake can produce a seiche in a lake in which the water sloshes back and

ID: 1875142 • Letter: A

Question

An earthquake can produce a seiche in a lake in which the water sloshes back and forth from end to end with remarkably large amplitude and long period. Consider a seiche produced in a farm pond Suppose the pond is 8.32 m long and assume it has a uniform width and depth. You measure that a pulse produced at one end reaches the other end in 2.80 s (a) What is the wave speed? Your response differs from the correct answer by more than 10%. Double check your calculations. m/s (b) What should be the frequency of the ground motion during the earthquake to produce a seiche that is a standing wave with antinodes at each end of the pond and one node at the center? Your response differs from the correct answer by more than 10%. Double check your calculations. Hz

Explanation / Answer

(A) wave speed = distance / time

v = 8.32 / 2.80

v = 2.97 m/s ....Ans

(B) L = wavelength / 2

wavelength = 2 L = 16.64 m


f = v / wavelength = 2.97 / 16.64

f = 0.178 Hz

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