A) 64 cm /s, in - x direction
B) 32 cm /s, in - x direction
C) 32 cm /s, in + x direction
D) 64 cm /s, in + x direction
Correct Answer: D
Solution :
\[y=4\sin \left( 4\pi t-\frac{\pi \,x}{16} \right)\]where, \[\omega =4\pi \] and \[k=\frac{2\pi }{\lambda }=\frac{\pi }{16}\] \[\Rightarrow v=\frac{\omega }{k}=64\] cm/s along + x direction.
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