Question

understanding and measuring ocean depths with echo sounding
part 1: understanding echo sounding
(scan the bar code and see the video)

1. what is echo sounding?
2. how does echo sounding help scientists measure the depth of the ocean?

part 2: how echo sounding works
instructions: read the steps below and put them in the correct order.
a) the sound wave hits the ocean floor and bounces back to the ship.
b) the ship sends out a sound pulse (ping) into the water.
c) the echo is received by the ships sensors.
d) the time it takes for the echo to return is measured.
correct order:
_, _, _, _
part 3: calculating ocean depth
a research ship sends a sonar ping straight down into the ocean. the sonar ping propagates from the transducer to the seabed and back, yielding a two - way travel time of 4 seconds. the speed of sound in seawater is about 1500 meters per second.
use the formula depth = (speed of sound × time) ÷ 2
speed of sound in seawater = _ meters/second
time for the echo to return = _ seconds
question:
what is the depth of the ocean at this point?
(hint: the sound wave travels to the ocean floor and back, so the time measured is for both ways.)
use the formula and make the calculations:
depth = _ meters

Explanation:

Step1: Identify given values

Speed of sound in seawater \( v = 1500\) meters/second, time for the echo to return \( t=4\) seconds.

Step2: Apply the formula

The formula for depth \(d=\frac{v\times t}{2}\). Substitute \(v = 1500\) and \(t = 4\) into the formula: \(d=\frac{1500\times4}{2}\).
First, calculate \(1500\times4 = 6000\). Then, divide by 2: \(\frac{6000}{2}=3000\).

Answer:

3000 meters