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

9th Class Science Sound Question Bank Sound Summative Objective Problems

  • question_answer
    A sonar device on a submarine send out a signal and receives an echo 5 seconds later. Calculate the speed of sound in water, if the distance of the object from the submarine is 3625 m.

    A)  1440 m/s                            

    B)  1460 m/s

    C)  1450 m/s            

    D)  1470 m/s

    Correct Answer: C

    Solution :

      \[t=5s\] \[d=3625\text{ }m\] \[v=?\] We know, \[V=\frac{2d}{t}=\frac{2\times 3625m}{5s}\] \[=1450\text{ }m{{s}^{1}}.\]       


You need to login to perform this action.
You will be redirected in 3 sec spinner