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For y = A sin(kx - wt), the speed of the wave is given by:
Av = w + k
Bv = w times k
Cv = k / w
Dv = w / k
Answer & Solution
Correct answer: D. v = w / k
Since k = 2 pi / lambda and w = 2 pi n, the speed n times lambda reduces to w / k.
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