The probability for transitions that lack this property in a two-level system is equal to e to the square of the off-diagonal element of the Hamiltonian divided by h-bar times a constant. Action-angle variables can be used to determine quantities named with this adjective that stay constant as time goes to infinity. According to a theorem named for this adjective, (15[1])a physical system stays in the same eigenstate if the Hamiltonian is perturbed slowly. (15[1])Two (15[1])(*) isothermal (10[1])processes along with two processes of this type make up the Carnot cycle. Heat capacity at constant pressure (10[1])is divided by heat capacity at constant volume to give an “index” named for this adjective. (10[2])Processes that are both reversible and have this property are isentropic. For 10 points, identify this adjective that describes processes with no heat transfer. ■END■