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Question 67
H

A ship uses sonar. The sonar sends a pulse of ultrasound vertically downwards and detects the echoes.

The Figure shows the display of the sonar.

The speed of ultrasound in sea water is 1500 m/s.

Figure

image

a.

Echo Q is from the seabed.

Use the Figure to determine the time taken for echo Q to return.

[1]
b.

Calculate the depth of the seabed below the ship.

[3]
c.

Echo P is from a shoal of fish.

Calculate the vertical distance between the shoal of fish and the seabed.

[3]
d.

Explain why the pulse produces an echo from the seabed even though it reaches the shoal of fish first.

[2]
Markscheme

4 Waves Questions

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