Assertion: doppler effect | /r/HasProperty | caused
Facets:
Source sentences:
text: As mentioned, the Doppler effect is caused because light and sound move in waves in just the same way that the waves of a pond move.
text: The Doppler Effect is caused when the source of a waveform—such as sound or light—sends out waves at a regular rate or frequency, but there is a constant relative motion between the source and observer, causing the observed frequency to change.