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

  • question_answer
    The loudness of a sound wave is directly proportional to its amplitude. Which of the following sound waves is the loudest?

    A)           

    B)  

    C)            

    D)  

    Correct Answer: D

    Solution :

      The loudness of a sound wave is directly proportional to its amplitude. The height of the crest or the depth of a trough of a wave is known as its amplitude. The height of the crests of the sound wave represented in alternative D is 3 units. It is the maximum among the four represented sound waves, which means that the sound wave represented in alternative D is the loudest. The correct answer is D.


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