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

Answer 

finding-defects-using-ultrasound.png

Metal blocks are used in building bridges, machines etc

Sometimes, these metal blocks look fine from outside but may have cracks inside

 

To detect it, ultrasound waves are passed

If there is no defect,these ultrasound waves pass through and are detected by detectors

But if there is a defect, these waves reflect back (and hence not detected by detector).

 

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CA Maninder Singh is a Chartered Accountant for the past 14 years and a teacher from the past 18 years. He teaches Science, Economics, Accounting and English at Teachoo