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

  • question_answer
    The wave form of a sound wave is shown in the given figure. Peak points M, N, and O are known as crests and points P and R are known as troughs.
    The height of the crest or the depth of a trough of a wave can be increased by

    A)  increasing its frequency

    B)  increasing its amplitude

    C)  decreasing its frequency

    D)  decreasing its wavelength

    Correct Answer: B

    Solution :

      The height of the crest or the depth of a trough of a wave is known as its amplitude. Hence, the height of the crest or the depth of a trough can be increased by increasing its amplitude. The correct answer is B.


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