Answers: January 12

January 19, 2009
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Problem: Hydrography: Hydrography at Sea

Mapping the seabed by echo sounding involves the transmission of acoustic waves through seawater. What is the most serious source of error in this procedure?

(A) the width of the acoustic beam
(B) the angle of incidence at the target
(C) spurious echoes
(D) the velocity of the signal

Solution: The velocity of the acoustic signal through seawater is the most important source of error in echo sounding.

Answer is (D)

This is problem 27(13-14) from the new second edition of “1001 Solved Surveying Fundamentals Problems” by Jan Van Sickle, PLS. Reprinted with permission from “1001 Solved Surveying Fundamentals Problems” by Jan Van Sickle, PLS (1997, 728 pp., Professional Publications Inc.). For details on this and other FLS exam-prep books, call 800/426-1178 or visit www.ppi2pass.com.

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