Name this change of frequencies such as redshifts and blueshifts caused by relative velocities between a source and observer.
The cooling named for this effect is a type of laser cooling that impacts particles within a certain range of speeds. A profile named for this effect is used to find the temperature of a gas based on the way that this effect broadens spectral lines. The transverse type of this effect is explained by the time dilation of special relativity and was confirmed by the Ives-Stilwell experiment. Astronomical measures of this effect led to the development of Hubble's Law and the belief that the universe is expanding. Name this change of frequencies such as redshifts and blueshifts caused by relative velocities between a source and observer.
The cooling named for this effect is a type of laser cooling that impacts particles within a certain range of speeds.
Doppler effect [accept Doppler shift or equivalents, prompt on "redshift" or "blueshift"]