A smooth flat discontinuity whose major plane is not perpendicular to the direction of sound propagation may be indicated by:

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Q. A smooth flat discontinuity whose major plane is not perpendicular to the direction of sound propagation may be indicated by:

(A) An echo amplitude comparable in magnitude to the back surface reflection
(B) A complete loss of back surface reflection
(C) An echo amplitude larger in magnitude than the back surface reflection
(D) All of the above

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✅ Correct Answer: (B) A complete loss of back surface reflection

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