One form of this quantity can be computed as the line integral of a connection over a closed path in parameter space. The partial-wave expansion gives each angular momentum component of the outgoing wave a different value of this quantity. The adiabatic approximation distinguishes dynamic and geometric forms of this quantity, the latter of which is named after Michael Berry. This quantity (-5[1])changes for an electron moving (10[1])around a solenoid in the Aharonov-Bohm effect. For a stationary state with energy E, this quantity changes after time t by "minus E t over h-bar." Waveplates operate by causing, for each polarization axis, a different shift in this quantity. (10[1])The difference in this quantity determines whether two waves interfere constructively (10[2])or destructively. (10[1])For 10 points, name this quantity representing the angular advancement of a wave. (10[1])■END■ (10[1]0[4])