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9th Class Science Sound Question Bank Sound Formative Objective Problems

  • question_answer
    An echo returned in 3s. What is the distance of the reflecting surface from the source, given that the speed of sound is 342 m/s?

    A)  520 m                                  

    B)  515 m

    C)  530 m                                  

    D)  513 m

    Correct Answer: D

    Solution :

      Time taken by sound to travel from the source to the reflecting surface, \[t=\frac{3}{2}=1.5\,s\]                 \[speed,v=342\text{ }m{{s}^{1}}\] \[\therefore \]Distance of reflecting surface from the source \[s=vt=342\times 1.5=513\text{ }m\]


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