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NEET NEET SOLVED PAPER 2018

  • question_answer
    The fundamental frequency in an open organ pipe is equal to the third harmonic of a closed organ pipe. If the length of the closed organ pipe is 20 cm, the length of the open organ pipe is  [NEET - 2018]

    A)  12.5 cm                     

    B)  8 cm

    C)  13.2 cm                     

    D)  16 cm

    Correct Answer: C

    Solution :

    For closed organ pipe, third harmonic \[\text{=}\frac{3v}{4l}\] For open organ pipe, fundamental frequency \[=\frac{v}{2l'}\] Given, \[\frac{3v}{4l}=\frac{v}{2l'}\] \[\Rightarrow l'=\frac{4l}{3\times 2}=\frac{2l}{3}\] \[=\frac{2\times 20}{3}=13.33cm\]


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