Exam-style question
Try this first
Which of the following best describes the Doppler effect?.
- A.A change in frequency due to the motion of the source or observer
- B.A change in amplitude of waves
- C.A phenomenon that only occurs with sound waves
- D.A method of measuring distance in space
Model answer
What a good answer should say
- A change in frequency due to the motion of the source or observer
Explanation
Why this works
The Doppler effect refers to the change in frequency or wavelength of waves in relation to an observer moving relative to the wave source. This effect is observed in both sound and electromagnetic waves, including light.
Common mistake
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