Two particles of medium disturbed by the wave propagation are at \(...

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Two particles of medium disturbed by the wave propagation are at \( x_{1}=0 \) and \( x_{2}=1 \mathrm{~cm} \). The respective
\( \mathrm{P} \) displacements (in \( \mathrm{cm} \) ) of the particles can be given by the equations :
W
\[
\begin{array}{l}
y_{1}=2 \sin 3 \pi t \\
y_{2}=2 \sin (3 \pi t-\pi / 8)
\end{array}
\]
The wave velocity is :
(A) \( 16 \mathrm{~cm} / \mathrm{sec} \)
(B) \( 24 \mathrm{~cm} / \mathrm{sec} \)
(C) \( 12 \mathrm{~cm} / \mathrm{sec} \)
(D) \( 8 \mathrm{~cm} / \mathrm{sec} \)
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