The Doppler effect is:

  1. the apparent change in frequency when a source moves relative to an observer
  2. the bending of waves
  3. a change in the speed of sound
  4. the reflection of sound
Answer

A) the apparent change in frequency when a source moves relative to an observer

Frequency observed ≠ frequency emitted. SLO P-11-D-02 · Understanding

Physics MCQ · More Wave Intensity and the Doppler Effect MCQs · Practise