Discussion
Assertion (A): A shock standing in the divergent section of a nozzle moves downstream as the back pressure is lowered.
Reason (R): A lower back pressure requires a weaker compression to match the exit condition.
Select the correct answer from the options below.
Answer: D
Both are true and the second explains the first. Further downstream the flow has accelerated to a higher Mach number, but the shock must deliver less total compression, and the balance works out so that the shock settles further from the throat. At the design back pressure it passes out of the nozzle entirely.
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