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Direct answer
Which NDE method uses high-frequency sound to evaluate internal reflectors is a TradeCert Prep study concept connected to CWI Practice Test prep, not a copied official exam item. Ultrasonic testing introduces high-frequency sound and interprets reflections from internal interfaces or discontinuities. Always verify licensing, certification, and testing rules with the current official candidate bulletin, state manual, code book, or testing provider before relying on a detail for compliance.
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Read the answer once, then prove it by choosing an answer in a practice question before looking at the explanation. If the miss repeats, tag the domain as NDE and drill a smaller set before returning to mixed practice.
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