Prob$-05$: A Mach $4$ right running airstream is near$-$isentropically $($weak shock$)$

deflected by $5$ into itself. The pressure and temperature before the deflection are $1$

bar and $300$ K respectively.

$($a$)$ Draw a schematic diagram of the flow situation.

$($b$)$ Calculate the Mach number, pressure of the deflected air flow.

$($c$)$ Compute the same in the case of a shock wave compression with a shock

angle of $18.$

$($d$)$ Compare the entropy change in the two situations.