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How deep is the water directly below the vessel if the time delay of the echo to the ocean floor and back is 6 seconds?
Wiki User
∙ 15y ago
SONAR* echo-sounders measure sound travelling through water. In sea water sound travels at 1,500 metres per second, or 4,800 ft per second, or 800 fathoms per second.
If it takes six seconds from the initial ping to detecting the echo, then 6 x 1,500 is 9,000 metres of travel. Half the time the beam was going down, half the time it was echoing back. So the distance from the ocean bed to the detector was 4,500 metres, or 4.5 kms or 2.8 miles. That's pretty deep!
Please note that computing depths is actually not quite as simple as the example given. Adjustments have to be made for water temperature, salinity and the pressure of the water. Even slight variations can cause significant errors to be made in depth calculation. Properly programmed and calibrated echo sounders take all these factors into account when giving their read-outs.
*SONAR is short for SOund Navigation And Ranging.
Wiki User
∙ 15y ago
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