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9th Class Science Sound Question Bank Sound Summative Objective Problems

  • question_answer
    Jim beats two empty drums. The sound waves produced by the drums are shown in the given figure.
    From the graphical form of the sound waves it can be said that the produced sounds have different

    A)  amplitudes       

    B)  intensities

    C)  volumes                             

    D)  pitches

    Correct Answer: D

    Solution :

      The pitch of a sound wave is its highness or lowness. It is directly proportional to the frequency of the sound wave. From the graphical form of the sound waves it can be observed that the numbers of cycles or crests/troughs in the two waves are different. Therefore, the frequencies of the waves are different. Hence, the pitches of the two sound waves are also different. The correct answer is D.


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