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JEE Main & Advanced Physics Wave Mechanics Question Bank Progressive Waves

  • question_answer
    The equation of a wave travelling in a string can be written as \[y=3\cos \pi (100\,t-x)\]. Its wavelength is [MNR 1985; CPMT 1991; MP PMT 1994, 97; Pb. PET 2004]

    A)            100 cm                                    

    B)            2 cm

    C)            5 cm                                         

    D)            None of the above

    Correct Answer: B

    Solution :

               Comparing the given equation with \[y=a\cos (\omega \,t-kx)\] We get \[k=\frac{2\pi }{\lambda }=\pi \] Þ l = 2cm


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