1.

The stationary wave \[y=2a\sin kx\cos \omega \,t\] in a closed organ pipe is the result of the superposition of \[y=a\sin (\omega \,t-kx)\]and                                              [Roorkee 1994]

A.            \[y=-a\cos (\omega \,t+kx)\]                                           
B.            \[y=-a\sin (\omega \,t+kx)\]
C.            \[y=a\sin (\omega \,t+kx)\]  
D.            \[y=a\cos (\omega \,t+kx)\]
Answer» C.            \[y=a\sin (\omega \,t+kx)\]  


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