Correct Answer: Option B

Explanation

y = 0.005 sin[x(0.5X - 200t)]

compare to Y = A sin(kx - wt)

\(\lambda\) = \(\frac{2\pi}{k}\) and F = \(\frac{w}{2\pi}\)

V= \(\lambda\)F

= \(\frac{2\pi}{0.5}\) x \(\frac{200}{2\pi}\)

= 400ms^-1

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