How is ultrasonic sound waves used to detect cracks in a metal block?
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Ultrasounds can be used to detect cracks and flaws in metal blocks. Ultrasonic waves are allowed to pass through the metal block and detectors are used to detect the transmitted waves. If there is even a small defect, the ultrasound gets reflected back indicating the presence of the flaw or defect...
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they are thrown inside water by a sender and after that when they reflected by rocks they got recorded on receiver. the time taken and the ways frequency detected by a ship detector allows the pilot to calculate the distance between rocks
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