Doppler effect Doppler effect The Doppler effect Doppler methodology the Doppler effect Doppler effect Doppler shift Doppler Effect lesson Waves 3D Doppler Effect (Doppler Effect) Doppler effect. ThePhysicsClassroom.com "The Doppler Effect – Lesson 3, Waves" Doppler shift Doppler methodology The Doppler Effect www.physicsclassroom.com