6. A sinusoidal wave, 0.01sin(0.2x-10t+π/2), is propagating on a string, where all terms are written in SI units. If the tension of this string is 10 N, what is the linear density of this string?
(A) 0.0004 kg/m
(B) 0.004 kg/m
(C) 0.04 kg/m
(D) 0.4 kg/m
(E) 4. kg/m

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