This physicist sometimes names the shock diamonds formed when the pressure of the exhaust (15[1])from a propeller nozzle is less than the ambient air pressure. An interferometer used to measure the phase shift between two light beams split from one source (15[1])is co-named for Ludwig Zehnder and this man’s son. This (15[1])physicist argued that the large scale structure of the universe fully determines the (*) local inertia of a body, (10[1])which Einstein called this physicist’s namesake (10[1])principle. When a quantity named for this physicist is less than around 0.3, fluid flow is approximately (10[1])incompressible. (10[1]-5[2])A quantity (-5[1])named for this physicist differentiates the subsonic, transsonic, and supersonic regimes. For 10 points, name this Austrian physicist who names a number equal to (10[1])a material’s velocity divided by its speed of sound. ■END■ (10[1]0[2])