4000ms-1
400ms-1
250ms-1
40ms-1
Correct answer is B
y = 0.005 sin[x(0.5X - 200t)]
compare to Y = A sin(kx - wt)
λ = 2πk and F = w2π
V= λF
= 2π0.5 x 2002π
= 400ms-1
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