Chapter - 5 Sound

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Explain how defects in a metal block can be detected using ultrasound.


Ultrasound is used to detect cracks and flaws in metal blocks used in the construction of buildings, bridges, machines and also scientific equipment, without damaging them.  

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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