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JEE Main & Advanced Physics Wave Mechanics Question Bank Progressive Waves

  • question_answer
    The equation of a longitudinal wave is represented as \[y=20\cos \pi (50t-x)\]. Its wavelength is [UPSEAT 2001; Orissa PMT 2004]

    A)            5 cm                                         

    B)            2 cm

    C)            50 cm                                      

    D)            20 cm

    Correct Answer: B

    Solution :

               By comparing it with standard equation                    \[y=a\cos (\omega t-kx)\]Þ\[k=\frac{2\pi }{\lambda }=\pi \]Þ \[\lambda =2cm\]


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