An air stream at M $=2\mathrm{.}0,$ pressure $=10$ psia, and temperature $=400$ R$,$ enters a diverging channel with an exit area$-$to$-$inlet area ratio of $3\mathrm{.}0.$ Determine the receiver $($back or freestream$)$ pressure required to produce a normal shock wave at an area ratio twice the inlet area. Except for the normal shock wave, the flow is isentropic with constant specific heats. An air stream at $M=2\mathrm{.}0,$ pressure $=10a,$ and temperature $=400R,$ enters a

diverging channel with an exit area$-$to$-$inlet area ratio of $3\mathrm{.}0.$ Determine the receiver

$($back or freestream$)$ pressure required to produce a normal shock wave at an area ratio

twice the inlet area. Except for the normal shock wave, the flow is isentropic with

constant specific heats.