Question

(a) How can ultrasound be used to detect the defects
in a metal block ?
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Answer 1

Answer:

=> DEFECTS ARE DETECTED IN METAL BLOCKS BY USING ULTRASOUND. IN THIS, ULTRASONIC WAVES ARE ALLOWED TO PASS THROUGH A 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.

Answer 2

Answer:

as ultrasound has the retentivity to pass through metals