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  3. 9th Class
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9th Class Science Sound Question Bank Sound Summative Objective Problems

  • question_answer
    A circular disc with 1500 holes in rotating at 720 r.p.m. If a jet of are passes through the hole, the frequency of sound emitted is

    A)  21600 hz             

    B)  2160 hz

    C)  \[\frac{1}{2160\,hz}\]                                   

    D)  None

    Correct Answer: A

    Solution :

      Not Available    


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