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Cambridge AS & A Level Physics

7.3Doppler effect for sound waves

Doppler effect for sound waves in Cambridge AS & A Level Physics: what the syllabus expects you to know, the learning objectives and how to practise.
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Learning objectives

What the syllabus expects you to be able to do.

  1. 7.3.1Explain why the observed frequency differs from the source frequency when a sound source moves relative to a stationary observer.
  2. 7.3.2Use the Doppler expression for a moving source and stationary observer.

Lessons

  • The Doppler effect for sound

    35 min

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Sample question

A sample question on this topic. Answer it, check it, then read the worked answer.

Doppler effect for sound waves: sample question

1 mark

A siren moves away from a stationary listener at constant speed. Which quantity, measured by the listener, is the same as it would be for a stationary siren?

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Turn Doppler effect for sound waves into a strength.

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