To decelerate an ideal gas isentropically from supersonic speed to subsonic speed the diffuser should be

Question

For accelerating an ideal gas isentropically from rest to supersonic speed, we require a convergent-divergent nozzle. To decelerate an ideal gas isentropically from supersonic speed to subsonic speed the diffuser should be

 (A) Diverging             (B) Converging

 (C) Convergent-divergent

(D) Divergent-convergent