Q. The most useful range of incident longitudinal wave angles for ultrasonic testing is:

(A) Normal incidence to the first critical angle
(B) First critical angle to the second critical angle
(C) Second critical angle to the third critical angle
(D) Above the third critical angle

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✅ Correct Answer: (A) Normal incidence to the first critical angle

Published by Mr. Dubey ⭐ 111.54K Points at 21-Sep-2023 07:19 pm in Non Destructive Testing and Evaluation

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