Discussion
For a normal shock at \( M_1 = 3 \), the density ratio is nearest to
Answer: D
The relation \( (\gamma+1)M_1^2/((\gamma-1)M_1^2+2) \) gives \( 21.6/(3.6+2) = 21.6/5.6 = 3.857 \). It is climbing towards the ceiling of six but slowly, which illustrates how much harder density is to compress than pressure is to raise.
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