Doppler effect
Doppler Effect
The Doppler Effect (pronounced: /ˈdɒplər/), also known as the Doppler Shift, is a phenomenon in Physics and Wave Theory named after the Austrian physicist Christian Doppler, who proposed it in 1842.
Etymology
The term "Doppler Effect" is derived from the name of its discoverer, Christian Doppler, who first proposed the concept in his work "Über das farbige Licht der Doppelsterne" in 1842.
Definition
The Doppler Effect refers to 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 heard when a vehicle sounding a siren or horn approaches, passes, and recedes from an observer.
Applications
The Doppler Effect is utilized in many fields such as Astronomy, where it is used to measure the velocity at which stars and galaxies are approaching or receding from us, i.e., their radial velocities. This is done by looking at the shift in the absorption lines in the spectrum of the star. In Medicine, the Doppler Effect is used in Ultrasound imaging to produce images of the inside of the human body. It is also used in Radar technology to determine the speed of a moving object.
Related Terms
External links
- Medical encyclopedia article on Doppler effect
- Wikipedia's article - Doppler effect
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