2. Questions Bank
  3. 9th Class
  4. Science
  5. Sound

9th Class Science Sound Question Bank Sound Conceptive Objective Problems

  • question_answer
    To hear distinct echo, the minimum distance of a reflecting surface should be

    A)  17 metres    

    B)  34 metres

    C)  68 metres          

    D)  340 metres

    Correct Answer: A

    Solution :

      To hear distinct echo, the minimum distance of a reflecting surface should be 17 meters.             


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