An Echo Sounder Operates by Measuring the Time Required for A___________

Multiple Choice

An echo sounder operates by measuring the time required for a___________ .

A) light beam to travel from a satellite at a known altitude to the sea bottom and back
B) sound pulse to travel from a ship or survey towfish to the seafloor and back
C) radar beam to travel from a ship to the seafloor and back
D) radar beam to travel from a harbour patrol boat to a fuzz- buster on a speeding yacht