Answer:
Ultrasonic waves can be used to detect the fault in a block
of metal using reflection of sound.
Ultrasound waves are allowed to pass through the metal
block. Transmitted waves are detected by the detectors. If there is even a
small defect, the ultrasound gets reflected back and does not reach the
detector. This is shown in figure below. This indicates the presence of a flaw
or defect like crack or hole, etc.
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