Helium is throttled from 175 lbf/in2; 70 F

Helium is throttled from 175 lbf/in2; 70 F to a pressure of 15 lbf/in2; the diameter of the exit pipe is so much larger than the inlet pipe that the inlet and exit velocities are equal. Find the exit temperature of the helium and the ratio of the pipe diameters.

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