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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
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B
1650 m/s
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C
1350 m/s
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D
967 m/s
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Solution

## The correct option is A 1450 m/sThe 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=2×Distancetraveled(m)Timetaken(s).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=2×3625m5s.Hence, the speed of the sound is 1450 m/s.

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