When testing a test piece with parallel front and back surfaces, no back wall echo can be obtained. Which of the following actions might enable you to obtain a back wall echo?

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Mr. Dubey

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Q. When testing a test piece with parallel front and back surfaces, no back wall echo can be obtained. Which of the following actions might enable you to obtain a back wall echo?

(A) Use a wetter transducer
(B) Use a lower frequency transducer
(C) Use a transducer with a narrower bandwidth
(D) Use a higher frequency transducer

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✅ Correct Answer: (B) Use a lower frequency transducer

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