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4.3 Sound, ultrasound and infrasound

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Question 32

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

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

4.3 Sound, ultrasound and infrasound Questions

GCSE
Physics
4.3 Sound, ultrasound and infrasound

112 exam-style questions on Edexcel GCSE Physics 4.3 Sound, ultrasound and infrasound, covering 4.3.1 Sound waves, vibrations and the human ear, 4.3.2 Ultrasound and infrasound, 4.3.3 Uses of ultrasound and infrasound, and 4.3.4 Sound waves passing between media. Each one has a worked solution and a mark scheme showing where the marks go.

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