1.

The equation of a wave travelling on a string is \[y=4\sin \frac{\pi }{2}\left( 8t-\frac{x}{8} \right)\]. If x and y are in cm, then velocity of wave is                                           [MP PET 1990]

A.            64 cm/sec in ? x direction
B.            32 cm/sec in ? x direction
C.            32 cm/sec in + x direction
D.            64 cm/sec in + x direction
Answer» E.


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