In the Mossbauer effect, this phenomenon is responsible for the suppression of nuclear recoil during photon emission, and its second-order, or transverse, variety exists only in relativistic systems. Responsible for the characteristic red shift observed for receding galaxies, this phenomenon is the frequency change in a signal between a source and a receiver that are moving relative to each other. For 10 points, name this
In the Mossbauer effect, this phenomenon is responsible for the suppression of nuclear recoil during photon emission, and its second-order, or transverse, variety exists only in relativistic systems. Responsible for the characteristic red shift observed for receding galaxies, this phenomenon is the frequency change in a signal between a source and a receiver that are moving relative to each other. For 10 points, name this effect whose acoustic version manifests as the sudden pitch change heard in a passing train whistle.
In the Mossbauer effect, this phenomenon is responsible for the suppression of nuclear recoil during photon emission, and its second-order, or transverse, variety exists only in relativistic systems.
{Doppler} effect (or shift)