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Q.

Ultrasounds are used to detect cracks and flaws in metal blocks because of their high [[1]]


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Detailed Solution

Ultrasounds are used to detect cracks and flaws in metal blocks because of their high frequency.
Ultrasound waves are those waves whose frequency is greater than 20000 Hz. These are used to detect flaws in solid structures instead of the sounds within the normal audible range because they have high frequencies and lower wavelengths. When the ultrasound waves are introduced into the metals, the waves are reflected back from the defected portion if there is any defect in the metal; hence, the fault's location is detected.
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