Using the results of the previous problem, show that for a harmonic wave with a phase φ(x, t) = k(x - vt) we can determine the speed by setting dφ/dt = 0. Apply the technique to Problem 2.32 to find the speed of that wave.

Data from Prob. 2.32

Use Eq. (2.33) to calculate the speed of the wave whose representation in SI units is

ψ(y, t) = A cos Ï€(3 × 10⁶y + 9 × 10¹⁴t)

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