The displacement of \( y \) of a wave travelling in the \( x \) direction is given by \( y=10^{-....

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The displacement of \( y \) of a wave travelling in the \( x \) direction is given by \( y=10^{-4} \sin (600 t-2 x+\pi / 3) \) metre,
\( \mathrm{P} \)
metre,

Where \( x \) is expressed in metre and \( t \) in second. The speed of the wave-motion, in \( \mathrm{ms}^{-1} \) is
(1) 300
(2) 600
(3) 1200
(4) 200


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