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JEE Main & Advanced Physics Wave Mechanics Question Bank Stationary Waves

  • question_answer
    A wave of frequency 100 Hz is sent along a string towards a fixed end. When this wave travels back after reflection, a node is formed at a distance of 10 cm from the fixed end of the string. The speed of incident (and reflected) wave are [CBSE PMT 1994]

    A)            40 m/s                                    

    B)            20 m/s

    C)            10 m/s                                    

    D)            5 m/s

    Correct Answer: B

    Solution :

                         At fixed end node is formed and distance between two consecutive nodes \[\frac{\lambda }{2}=10\]\[cm\]\[\Rightarrow \]\[\lambda =20\]\[cm\]                    \[\Rightarrow \] \[v=n\lambda =20\] m/sec


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