Question

A fish finder uses sonar to find fish under water. It does this by sending out a pulse of sound and measuring the time for the sound to return. If it takes 0.016 s for sound to be detected after being emitted, how far away are the fish? Hint, the speed of sound in water is 1440 m/s.

Answer 1

Answer on Question #47920, Physics, Mechanics — Kinematics — Dynamics A fish finder uses sonar to find fish under water. It does this by sending out a pulse of sound and measuring the time for the sound to return. If it takes 0.016 s for sound to be detected after being emitted, how far away are the fish? Hint, the speed of sound in water is 1440 m/s.

Solution

Half of time sound travels to the fish and half of time it returns. Fish is at the distance

$s=\frac{vt}{2}=\frac{1440\cdot 0.016}{2}=115.2\,m$

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