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    2.

    Two closed pipes produce 1010 beats per second when emitting their fundamental nodes. If their lengths are in ratio of 25:2625{\rm{ }}:{\rm{ }}26. Then their fundamental frequency in HzHz, are

    A

    $\begin{array}{*{20}{l}}

    {270,{\rm{ }}280}

    \end{array}$

    B

    $\begin{array}{*{20}{l}}

    {260,{\rm{ }}270}

    \end{array}$

    C

    $\begin{array}{*{20}{l}}

    {260,{\rm{ }}250}

    \end{array}$

    D

    $\begin{array}{*{20}{l}}

    {260,{\rm{ }}280}

    \end{array}$

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