📊 Non Destructive Testing and Evaluation
Q. When a probe is coupled to a solid, strong surface waves may be produced:
  • (A) If a high frequency probe is used
  • (B) If the probe has only incomplete contact with the surface
  • (C) If the probe is large in diameter
  • (D) None of the above
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✅ Correct Answer: (D) None of the above

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