Air flows under steady, approximately one-dimensional conditions through the conical nozzle in Fig. P4.21. If the speed of sound is approximately 340 m/s, what is the minimum nozzle-diameter ratio DelDo

for which we can safely neglect compressibility effects if Vo = (a) 10 m/s and(b) 30 m/s? (a) [0.31] (b) [0.54]