Two tuning forks $A$ and $B$ produce $8\,beats/s$ when sounded together. $A$ gas column $37.5\,cm$ long in a pipe closed at one end resonate to its fundamental mode with fork $A$ whereas a column of length $38.5\,cm$ of the same gas in a similar pipe is required for resonance with fork $B$. The frequencies of these two tuning forks, are

  • A

    $308\,Hz, 300\,Hz$

  • B

    $208\,Hz, 200\,Hz$

  • C

    $300\,Hz, 400\,Hz$

  • D

    $350\,Hz, 500\,Hz$

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