1.

The displacement y of a particle in a medium can be expressed as: \[y={{10}^{-6}}\sin (100t+20x+\pi /4)m,\] where t is in second and x in meter. The speed of wave is  [AIEEE 2004]

A.            2000 m/s                                
B.            5 m/s
C.            20 m/s                                    
D.            \[5\pi \text{ }m/s\]
Answer» C.            20 m/s                                    


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