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BCECE Medical BCECE Medical Solved Papers-2002

  • question_answer
    On producing the waves of frequency 1000 Hz in a Kundts tube, the total distance between 6 successive nodes is 85 cm. Speed of sound in the gas filled in the tube is :

    A)  300 m/s      

    B)  350 m/s

    C)  340 m/s      

    D)  330 m/s

    Correct Answer: C

    Solution :

    The relation between distance of successive nodes and wavelength of the wave is                 \[s=85=\frac{(n-1)\lambda }{2}=\frac{(6-1)\lambda }{2}=\frac{5\lambda }{2}\] \[\Rightarrow \] \[\lambda =\frac{85\times 2}{5}=34\,cm=0.34\,m\] Speed of sound \[v=f\,\lambda \], where \[f\] is frequency and \[\lambda \] is wavelength. \[v=1000\times 0.34=340\,m/s\]


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