Air at 1100 kPa in a reservoir expands through a convergent divergent nozzle into the ambient. The exit to throat area ratio is 2. The ambient pressure is 120 kPa initially and is then gradually increased. Determine the Mach number and static and stagnation pressure at the exit as well as the ambient pressure at each of the following instants: (i) initial (ii) when a normal shock first appears (iii) when a normal shock occurs at a location where A/Athroat = 1.55526 and (iv) when the normal shock disappears.