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

Answer:

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