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



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).


  1. Class 9
  2. Chapter 12 Class 9 - Sound (Deleted)

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CA Maninder Singh
CA Maninder Singh is a Chartered Accountant for the past 11 years and a teacher from the past 11 years. He teaches Science, Accounts and English at Teachoo