This phenomenon is used to prevent the source in MÃ¶ssbauer spectroscopy from being monochromatic.
This phenomenon is responsible for a form of spectral line broadening with a Gaussian profile. This phenomenon is the basis for a form of ultrasound which measures blood flow. This phenomenon is used to prevent the source in MÃ¶ssbauer spectroscopy from being monochromatic. Light with energy just below that of an electronic transition is used in a form of (*) laser cooling reliant on this effect. In relativistic cases, the magnitude of this effect is equal to the square root of one plus beta over one minus beta. Classically this phenomenon is related to the velocity of the wave of interest, the source, and the receiver. This phenomenon explains why objects moving away from the viewer appear to be redshifted. For 10 points, name this phenomenon that explains the difference in pitch heard from a siren as it goes towards and away from a listener.
This phenomenon is responsible for a form of spectral line broadening with a Gaussian profile.
Doppler effect [prompt on redshift] 