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JEE Main & Advanced Physics Wave Mechanics Question Bank Progressive Waves

  • question_answer
    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

    Correct Answer: C

    Solution :

               \[v=\frac{\text{Co-efficient of }t}{\text{Co-efficient of }x}\]\[=\frac{628}{31.4}=20\,cm/sec\]


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