A sonar pulse is sent to the ocean bottom at 25°C, and it takes 1.20 s for the echo to come back. How deep is the bottom? 0.90 km , 0.92 km , 1.79 km, or 1.84 km ?

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A sonar pulse is sent to the ocean bottom at 25°C, and it takes 1.20 s for the echo to come back. How deep is the bottom? 0.90 km , 0.92 km , 1.79 km, or 1.84 km ?

Physics
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we have to know how much is the speed of sound inside a sea water
I found that value in my textbook: it is 1,460 m/sec
oh oops sorry i am drawing the table now :P |dw:1433187822896:dw|

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ok! ten we can pick 1,533 m/sec
:)
so we can write: \[\Large 1.2 = \frac{{2d}}{{1533}}\] where d is the requested deepness, there the factro 2, is to take account that we are dealing with the echo
factor*
ok! and then we get this? 1839.6=2d d=919.8 ?
yes!
d=919.8 meters= 0.92 Km (approximated value)
yay!! thank you!!:D
:)

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