In an application of this phenomenon, cesium atoms can be slowed down in atomic clocks because the atoms absorb photons, recoil, and lose momentum.
In an application of this phenomenon, cesium atoms can be slowed down in atomic clocks because the atoms absorb photons, recoil, and lose momentum. Steven Chu won a Nobel Prize for investigating the "cooling" mechanism of this effect. A relativistic factor for this effect equals the square root of one plus beta over one minus beta. It was used to prove general relativity in the Pound-Rebka experiment. This effect includes a term for the source velocity and the observer's velocity. For 10 points, name this effect which causes a shift in observed frequencies for moving objects, which is why ambulance sirens change pitch.
In an application of this phenomenon, cesium atoms can be slowed down in atomic clocks because the atoms absorb photons, recoil, and lose momentum.
Doppler Effect