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Assertion (A): Pressure-sensitive paint gives a continuous map of surface pressure.

Reason (R): Its luminescence is quenched in proportion to the local oxygen partial pressure.

Select the correct answer from the options below.

  • A.Both A and R are true, but R is not the correct explanation of A
  • B.A is true but R is false
  • C.A is false but R is true
  • D.Both A and R are true, and R is the correct explanation of A

Answer: D

Both are true and the second explains the first. Because the response is a property of the coating rather than of discrete instrumentation, every painted point is a measurement. The practical difficulty is temperature sensitivity, which must be calibrated out carefully.

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