3. (30 points). You go on vacation and return to find a wind tunnel in your

lab is filled with a mystery gas that is either nitrogen (k = 1.400) or

helium (k = 1.667). Your colleague has left you a post-it note saying that

she determined the temperature to be 293 K, the Mach number to be 1.2,

and the wind speed to be 1208 m/s.

(a) Which gas fills the wind tunnel?

(b) What would the wind speed be if the wind tunnel was filled with the

other gas?