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AMU Medical AMU Solved Paper-1997

  • question_answer
    Velocity of sound in air is\[320\text{ }m{{s}^{-1}}\]. A pipe closed at one end has a length of 1m. (Neglecting ends corrections). The air column in the pipe cannot resonate for sound of frequency

    A)  80 Hz           

    B)  240 Hz

    C)  320 Hz          

    D)  400 Hz

    Correct Answer: C

    Solution :

    : Fundamental frequency of closed pipe \[n=\frac{v}{4l}\] \[\therefore \] \[n=\frac{320}{4\times 1}=80\,Hz\] Harmonics have frequencies 3n, 5n, .......odd n. Even multiples of fundamental (80 Hz) are not present. \[\therefore \]\[80\times 4=320\text{ }Hz\] is not present. The pipe cannot resonate for 320 Hz.


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