Air at 1.3 bar, 423K and velocity of around 40 m/s enters a nozzle working at steady state and expands adiabatically to the exit, where the pressure is 0.85 bar and velocity is 307 m/s. For air modeled as the ideal gas having k = 1.4, find out for the nozzle (i) the temperature at the exit, in K, and (ii) the isentropic efficiency of the nozzle.