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JEE Main & Advanced Physics Wave Mechanics Question Bank Self Evaluation Test - Waves

  • question_answer
    A tuning fork of frequency 512 Hz makes 4 beats per second with the vibrating string of a piano. The beat frequency decreases to 2 beats per sec when the tension in the piano string is slightly increased. The frequency of the piano string before increasing the tension was

    A)  \[510\,Hz\]          

    B)         \[514\,Hz\]

    C) \[516\,Hz\]          

    D)        \[508\,Hz\]

    Correct Answer: D

    Solution :

    [d] The frequency of the piano string \[=512\pm 4\] = 516 or 508. When the tension is increased, beat frequency decreases to 2, it means that frequency of the string is 508 as frequency of string increases with tension.


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