1.

The phase difference between two points separated by 0.8 m in a wave of frequency is 120 Hz is \[\frac{\pi }{2}.\] The velocity of wave is                                                      [Pb. PET 2000]

A.            720 m/s                                  
B.            384 m/s
C.            250 m/s                                  
D.            1 m/s
Answer» C.            250 m/s                                  


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