The echo on the cathode ray tube (CRT) which represents the far boundary of the material being tested is called:

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Q. The echo on the cathode ray tube (CRT) which represents the far boundary of the material being tested is called:

(A) Hash
(B) The initial pulse
(C) The ‘main bang’
(D) The back wall echo

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✅ Correct Answer: (D) The back wall echo

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