NEET Sample Paper NEET Sample Test Paper-1

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

    A)  \[40\,m/s\]              

    B)  \[20\,m/s\]

    C)  \[10\,m/s\]              

    D)  none of these

    Correct Answer: B

    Solution :

    Here, frequency  \[n=100Hz.\] Distance from fixed end \[=10\,cm=0.1m\] When a stationary wave is produced, the fixed end behaves as a node. Thus, wavelength is given by             \[\frac{\lambda }{2}=0.1\]                 \[\lambda =2\times 0.1=0.2m\] Hence, the velocity \[V=n\lambda =100\times 0.2=20\,m/s.\]

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