A sonar unit on a submarine sends out a pulse of sound into seawater. The pulse returns 1.28 s later. What is the distance to the object that reflects the pulse back to the submarine?

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- Mar 1st 2008, 07:34 PMlovinhockey26sonar unit
A sonar unit on a submarine sends out a pulse of sound into seawater. The pulse returns 1.28 s later. What is the distance to the object that reflects the pulse back to the submarine?

- Mar 1st 2008, 10:34 PMearboth
This process depends on the sort of water (saltwater, ...) and the temperature. The only value of the speed of sound in water which I have at hand is:

$\displaystyle v_s = 1485\ \frac ms$

The distance traveled by the sound signal is:

$\displaystyle d = 1.28\ s \cdot 1485\ \frac ms = 1900.8\ m$

Therefore the object is at a distance of 950.4 m