Air expands isentropically from 2.2 MPa and 95°C to 0.4 MPa. Calculate the ratio of the initial to final speed of sound. The properties of air are R = 0.287 kJ/kg·K and k = 1.4. The specific heat ratio k varies with temperature, but in our case this change is very small and can be disregarded.  What is the ratio of the initial to final speed of sound?

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