Question

A sonar device on a submarine sends out a signal and receives an echo 5 s later. Calculate the speed of sound in water if the distance of the object from the submarine is 3625 m :

• A. 1450 m/s
• B. 1650 m/s
• C. 1350 m/s
• D. 967 m/s

Answer 1

The correct option is A 1450 m/s

The speed of the sound, distance traveled and the time taken relationship if the sound is a reflected sound, that is echo, it is given as follows.
$Speedofsound=\frac{2\times Distancetraveled\left(m\right)}{Timetaken\left(s\right)}$.
In the question it is given that distance traveled by the sound from the object to the submarine is 3625 meters and the time taken to hear the echo is 5 seconds.
The speed of the sound wave is calculated as follows.$v=\frac{2\times 3625m}{5s}$.
Hence, the speed of the sound is 1450 m/s.