1.

Equation of a progressive wave is given by                    \[y=4\sin \left\{ \pi \left( \frac{t}{5}-\frac{x}{9} \right)+\frac{\pi }{6} \right\}\]            Then which of the following is correct [CBSE PMT 1993]

A.            \[v=5\,m/\sec \]                
B.            \[\lambda =18\,m\]
C.            \[a=0.04\,m\]                      
D.            \[n=50\,Hz\]
Answer» C.            \[a=0.04\,m\]                      


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