1.

The equation of a wave is\[y=2\sin \pi (0.5x-200t)\], where x and y are expressed in cm and t in sec. The wave velocity is [MP PMT 1986]

A.            100 cm/sec                            
B.            200 cm/sec
C.            300 cm/sec                            
D.            400 cm/sec
Answer» E.


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