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doppler effect
The Doppler effect
frequency.
frequency.
The Doppler effect
Doppler effect
The Doppler effect helps measure the speed of moving objects. The most common Doppler effect is the sound of a police siren, as it passes you. The sound of the siren remains constant to the person in the vehicle, but as it approaches you, the pitch, or frequency appears to lower.
The sound waves in front of the siren bunch up, and those behind the siren spread out.
The sound waves in front of the siren bunch up, and those behind the siren spread out.
This is known as the Doppler effect. The pitch changes as the vehicle stops moving towards you, and starts to move way from you.
The Doppler effect
all you have to do is stop the car and get out of the car and listen to the police siren