Polished, flat surfaces are undesirable for ultrasonic testing consideration because:

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Q. Polished, flat surfaces are undesirable for ultrasonic testing consideration because:

(A) Coupling losses are greater
(B) Scan speeds tend to be too rapid
(C) Spurious lamb waves are prevalent
(D) The probe sticks to the surface because of suction

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✅ Correct Answer: (D) The probe sticks to the surface because of suction

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