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  3. 8th Class
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  5. Sound

8th Class Science Sound Question Bank Sound Conceptive Objective Problems

  • question_answer
    An echo of the sound produced can be heard only if it reaches our ear after

    A)   \[\frac{1}{15}\]th of a second  

    B)   \[\frac{1}{13}\]th of a second

    C)  \[\frac{1}{10}\]th of a second   

    D)  \[\frac{1}{5}\]th of a second

    Correct Answer: C

    Solution :

      Not Available


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