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are used to detect flaws inside a metal....

______ are used to detect flaws inside a metal.

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{:(,"Column A",,, "Column B"),(A., "Frequency", (), a., "Detect flaws inside a metal"),(B., "The loudness of sound", ( ), b., "Ghatam"),(C., "The angle of incidence", ( ), c., "Equal to the angle of reflection of sound"),(D., "Ultrasounds", ( ), d., "Amplitude"),(E., "Ghana vadya", (), e., "Ratio of the number of oscillations to the time taken"):}

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