The Doppler Effect
1 mark · EasyState what is meant by the Doppler effect.
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The apparent change in frequency of a wave observed when the source of the wave is moving relative to the observer.
Also accept: The change in frequency of a wave caused by the motion of the source relative to an observer.
Common mistakes: Describing it only as a change in loudness.; Only mentioning movement, not the change in frequency.
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Marking points
B1 · 1 mark · Correctly states the Doppler effect as an apparent change in frequency due to relative motion between source and observer.
Worked solution
The Doppler effect is the apparent change in frequency of a wave observed when the source of the wave is moving relative to the observer.