The difference between the frequency of a wave (as of sound or light) as measured at its source and as measured by an observer in relative motion. The Doppler effect can be used to determine the relative speed of an object by bouncing a wave (usually a radar wave) off the object and measuring the shift in the frequency of the wave. This technique is the basis of Doppler radar, as used in traffic control and navigation systems. The Doppler effect is also known as the Doppler shift. &diamf3; If the source and the observer are getting farther apart, the observed frequency is lower than the source frequency. In the case of light waves, the phenomenon is known as red shift . The amount of red shift in the spectra of stars is used in astronomy to determine how quickly the Earth and those stars are moving apart. &diamf3; If the source and the observer are getting closer together, the observed frequency is higher than the source frequency. In the case of light waves, the phenomenon is known as blue shift .
(Politics) The statistical bias towards Republican (Blue Dog) candidates of US federal elections whose reported results vary considerably from those indicated by voter exit polls.
Find another word for red-shift. In this page you can discover 3 synonyms, antonyms, idiomatic expressions, and related words for red-shift, like: doppler effect, violet shift and redshift.