Doppler
**Doppler**
What is Doppler?
The Doppler effect (or Doppler shift) is the change in frequency or wavelength of a wave in relation to an observer who is moving relative to the wave source. It is commonly used in radar for measuring the velocity of objects, in medical imaging (Doppler ultrasound), and in astronomy to determine the speed at which stars and galaxies are approaching or receding from Earth. It is also used in everyday life; the change in pitch of a siren as it passes is an example of the Doppler effect.
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