Assertion: doppler effect | /r/HasProperty | perceived change
Facets:
value: in frequency of sound
type: OTHER
value: in wavelength
type: OTHER
value: in frequency
type: OTHER
Source sentences:
text: The Doppler Effect–the perceived change in frequency of all sorts of waves, including light waves and sound waves–is nowadays most commonly heard from a moving siren on an ambulance, fire engine, or police car
text: The Doppler effect is the perceived change in frequency or wavelength caused when the source of the waveform is moving.
text: The Doppler effect is the perceived change in frequency of sound emitted by a source moving relative to the observer: as a plane flies overhead, the note of the engine becomes noticeably lower, as does the siren noise from a fast-moving emergency vehicle as it passes.