A wave travelling in a stretched string is described by the P equat...

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A wave travelling in a stretched string is described by the
P equation \( y=A \sin (\omega t-k x) \)

W
(A) Wave velocity is \( \frac{\omega}{k} \)
(B) Group velocity is \( \frac{a \omega}{d k} \)
(C) Wave velocity is \( A \omega \)
(D) Group velocity is \( A \omega \)
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