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  3. 9th Class
  4. Science
  5. Sound

9th Class Science Sound Question Bank Sound Formative Objective Problems

  • question_answer
    If the distance between a crest and the adjoining trough is 20 cm. Then the wave - length will be

    A)  30 cm     

    B)  20 cm

    C)  40 cm                  

    D)  25 cm

    Correct Answer: A

    Solution :

      Not Available                    


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