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Haryana PMT Haryana PMT Solved Paper-2002

  • question_answer
    Wave of frequency 100 Hz travels along a string towards its fixed end. When this wave travels back, after reflection a node is formed at a distance of 10 cm from the fixed end. The speed of the wave (incident and reflected) is :

    A)  5 m/s                                   

    B)  10 m/s

    C)  20 m/s                                

    D)  40 m/s

    Correct Answer: C

    Solution :

                     From fixed end of string node is formed at a  distance between two nodes = 10 cm                 \[\frac{\lambda }{2}=10cm\]                 \[l=20cm=0.2m\] velocity \[\upsilon =n\lambda \]                 \[=100\times 0.2\]                 \[=20m/s\]


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