Discussion
Assertion (A): The Prandtl-Glauert correction remains accurate right up to Mach one.
Reason (R): The correction divides the incompressible coefficients by the square root of one minus the Mach number squared.
Select the correct answer from the options below.
Answer: A
The assertion is false while the reason correctly states the rule. The factor tends to zero as Mach one is approached, so the predicted coefficients become unbounded, which is physically impossible. The correction is a linearisation and fails once local supersonic flow appears, that is above the critical Mach number.
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