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Model Paper 10 — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceModel Paper 102 Marks
Question
Explain how defects in a metal block can be detected using ultrasound.
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Answer

The ultrasound waves are allowed to pass through metal block to which detectors are fitted. If there is a small defect in the metal block like an air bubble or a crack, then the ultrasound waves are reflected from such spots. Metal block if defective is indicated by the reflected ultrasonic waves.

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