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JEE Main & Advanced Physics Wave Mechanics Question Bank Stationary Waves

  • question_answer
    Two sinusoidal waves with same wavelengths and amplitudes travel in opposite directions along a string with a speed 10 ms?1. If the minimum time interval between two instants when the string is flat is 0.5 s, the wavelength of the waves is                                                     [Roorkee 2000]

    A)            25 m                                        

    B)            20 m

    C)            15 m                                        

    D)            10 m

    Correct Answer: D

    Solution :

                         Minimum time interval between two instants when the string is flat = \[\frac{T}{2}=0.5\sec \Rightarrow T=1\sec \] Hence \[\lambda =v\times T=10\times 1=10\,m\].


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