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(a) What is the frequency of the water wave?

Hz

(b) What is the speed of the wave?

m/s

(c) What is the wavelength of the waves?

m

(d) Write a mathematical expression for the wavefunction (x, t) assuming it is a sinusoidal wave with the duck located at the origin for x and at a peak of the wave when t = 0 s.

(x, t) = cos( x - t)

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Please explain as well, don't just calculate. Thanks.