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BCECE Engineering BCECE Engineering Solved Paper-2002

  • question_answer
    A resonance air column of length 20 cm resonates with a tuning fork of frequency 250 Hz. The speed of the air is:

    A)  75 m/s                                

    B)  150 m/s

    C)  200 m/s              

    D)         300 m/s

    Correct Answer: C

    Solution :

    If n is the frequency of the note emitted and \[v\]the velocity of sound and \[l\] the length of air column, then \[n=\frac{v}{4l}\]                 \[\therefore \]  \[250=\frac{v}{4l}\]             \[\Rightarrow \]   \[v=250\times 4\times 0.2=200\,m/s\]


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