i was taught that it is what an ambulance does when it goes past
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Examples of the Doppler Effect include the change in pitch of a siren as it approaches and then passes by, the change in frequency of sound waves when a moving car honks its horn, and the shift in the wavelength of light from a star as it moves toward or away from Earth.
the Doppler effect involves moving objectsthe Doppler effect involves moving objects
The Doppler Effect was named after Austrian physicist Christian Doppler, who first described it in 1842.
The change in frequency of a sound due to motion of the source is called the Doppler effect. If the source is moving towards the observer, the frequency of the sound appears higher (blueshifted), while if the source is moving away, the frequency appears lower (redshifted). This effect is commonly experienced with passing vehicles and sirens.
The Doppler effect was discovered by Austrian physicist Christian Doppler in 1842. He observed that the frequency of sound waves changes when the source of the sound is in motion relative to the observer.
Doppler effect