Consider a centered, one-dimensional, unsteady expansion wave propagating into quiescent air with (p_{4}=10 mathrm{~atm}) and (T_{4}=2500 mathrm{~K}).

Question:

Consider a centered, one-dimensional, unsteady expansion wave propagating into quiescent air with $p_{4}=10 \mathrm{~atm}$ and $T_{4}=2500 \mathrm{~K}$. The strength of the wave is given by $p_{3} / p_{4}=0.4$. Calculate the velocity and Mach number of the induced mass motion behind the wave, relative to the laboratory.

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