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     EduGorilla 
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    Tuning fork A of frequency 305 Hz produces 5 beats/sec with another tuning fork B. After filling tuning fork B, it produces 3 beats/sec with A. The frequency of B before filling was:

    Options :-

    1. 300 Hz
    2. 313 Hz
    3. 310 Hz
    4. 308 Hz
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