Using the results of the previous problem, show that for a harmonic wave with a phase Ф(x, t) = k(x − vt) we can determine the speed by setting dФ/dt = 0. Apply the technique to Problem 1 to find the speed of that wave.
Problem 1
Use Eq. (2.33) to calculate the speed of the wave whose representation in SI units is
Ψ(y,t) = A cos п(3 × 106y + 9 × 1014t)
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