Science
Explain how defects in a metal block can be detected using ultrasound.
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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, as shown below:
![Explain how defects in a metal block can be detected using ultrasound. NCERT Class 9 Science CBSE Solutions.](https://cdn1.knowledgeboat.com/img/ncert-9/q17-c11-ex-ncert-science-solutions-class-9-309x448.png)
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