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9th Class Science Sound Question Bank Sound Formative Objective Problems

  • question_answer
    The frequency of a source of sound is 100 Hz. How many times it vibrates in a minute?

    A)  5000                                     

    B)  6000

    C)  5400                                     

    D)  5500

    Correct Answer: B

    Solution :

      Frequency = 100 Hz \[\therefore \]Number of vibrations in 1 second= 100 \[\therefore \]Number of vibrations in 60 second \[=100\times 60=6000\]


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