جستجو
Doppler effect
01
اثر داپلر
the change in frequency or wavelength of a wave in relation to an observer who is moving relative to the source of the wave, producing a shift in pitch or color
doppler effect
n
مثال
In astronomy, the Doppler effect helps scientists determine the speed and direction of celestial objects.
The Doppler effect is employed in police radar guns to measure the speed of moving vehicles.
When a car with a honking horn drives by, the change in pitch you hear is due to the Doppler effect.
The color shift in the light from a moving star is an example of the Doppler effect in astrophysics.
The Doppler effect explains why the pitch of an ambulance siren changes as it approaches and then passes by.
