1.

The equation of a progressive wave is given by                    \[y=a\sin (628t-31.4x)\] If the distances are expressed in cms and time in seconds, then the wave velocity will be                                             [DPMT 1999]

A.            314 cm/sec                            
B.            628 cm/sec
C.            20 cm/sec                              
D.            400 cm/sec
Answer» D.            400 cm/sec


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