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9th Class Science Sound Question Bank Sound

  • question_answer
    A pendulum vibrates with a time period of 1 second. What kind of sound is produced by it?

    A) Supersonic   

    B)        Audible

    C) Infrasonic                        

    D) Ultrasonic

    Correct Answer: C

    Solution :

    Sound waves of frequency less than \[20\,\,Hz\] are called infrasonic sound waves.


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