The Doppler Effect

The Doppler Effect results when a wave source and an observer are in relative motion. The most notable example is with sound, but it occurs with all waves. Click on each link below to see examples and explanations of the Doppler Effect.

• Doppler Effect (police car - observer's viewpoint)
• Doppler Effect (police car - source's viewpoint)
• Explanation of the Doppler Effect
• Doppler Effect Applet