The equation of plane progressive wave motion is \( y=a \sin \frac{2 \pi}{\lambda}(v t-x) \). Ve...

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The equation of plane progressive wave motion is \( y=a \sin \frac{2 \pi}{\lambda}(v t-x) \). Velocity of the particle is
(a) \( y \frac{d v}{d x} \)
(b) \( v \frac{d y}{d x} \)
(c) \( -y \frac{d v}{d x} \)
(d) \( -v \frac{d y}{d x} \)
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