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JEE Main & Advanced Physics Wave Mechanics Question Bank Critical Thinking

  • question_answer
    16 tunning forks are arranged in the order of increasing frequencies. Any two successive forks give 8 beats per sec when sounded together. If the frequency of the last fork is twice the first, then the frequency of the first fork is [CBSE PMT 2000; MP PET 2001]

    A)            120

    B)            160

    C)            180

    D)            220

    Correct Answer: A

    Solution :

                       Using nLast = nFirst + (N ? 1)x Þ 2n = n + (16 ? 1) ´ 8 Þ n = 120 Hz


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