The Doppler effect describes the change in the observed frequency of a wave when there is relative motion between the wave source and the observerThe Doppler effect describes the change in the observed frequency of a wave when there is relative motion between the wave source and the observerThe Doppler effect describes the change in the observed frequency of a wave when there is relative motion between the wave source and the observerThe Doppler effect describes the change in the observed frequency of a wave when there is relative motion between the wave source and the observerThe Doppler effect describes the change in the observed frequency of a wave when there is relative motion between the wave source and the observerThe Doppler effect describes the change in the observed frequency of a wave when there is relative motion between the wave source and the observer
