How can ultrasound be used to detect flaws in a metal block?

Question

How can ultrasound be used to detect flaws in a metal block? — Exam MCQ

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A. By measuring the reflection of waves at internal cracks — The correct choice is By measuring the reflection of waves at internal cracks. Sound behaviour is determined by wave properties such as frequency, amplitude, wavelength and the medium of propagation.

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B. By heating the block with the ultrasound

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C. By observing visible movement inside the block

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D. By measuring the color of the metal

How can ultrasound be used to detect flaws in a metal block?

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