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Learning objective

Define an echo as the sound that is reflected back after hitting a surface.

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  • Read the explanation.
  • Check key terms.
  • Practise with linked questions.
Cambridge IGCSE PhysicsSubject contentCore content

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Quick explanation

Define an echo as the sound that is reflected back after hitting a surface

  • This point belongs to Sound, especially Sound outcomes.
  • You need to be able to define an echo as the sound that is reflected back after hitting a surface.
  • The key ideas to know are Describe.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

Describe

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Description

Echoes

An echo is produced when sound waves reflect off a surface and return to the listener. The time it takes for the echo to return can be used to determine the distance to the reflecting surface.

  1. a

    State the definition of an echo.

    Aim for approximately 1 distinct marking point.

    [1]
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