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9th Class Science Sound Question Bank Sound Summative Objective Problems

  • question_answer
    Which of the following pairs of sound waves represents sounds of different levels of loudness?

    A)                

    B)  

    C)               

    D)  

    Correct Answer: C

    Solution :

      The loudness of a sound wave is directly proportional to its amplitude. Therefore, the sound waves having the same amplitude have the same loudness. Among the given alternatives only the waves given in alternative C have different amplitudes. Therefore, these waves have different loudness levels. The correct answer is C.


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