During a hydrographic survey an echo sounder on a stationary platform registers the sea-bed echo after a time delay of 3.0s.
(a) If the water temperature at the site is 25∘C, the speed of sound may be taken as 1510ms−1. Calculate the actual depth of the water.
(b) The operator mistakenly assumes the speed of sound to be 1440ms−1 (a value appropriate to 5∘C). Compute the percentage error introduced in the depth reading due to this wrong assumption.