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What is the maximum frequency used in the ultrasonic inspection?

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What is the maximum frequency used in the ultrasonic inspection?

(a) 35 MHz

(b) 40 MHz

(c) 45 MHz

(d) 50 MHz

I had been asked this question in my homework.

Question is from Ultrasonic Inspection topic in chapter Non Destructive Techniques of Casting-Forming-Welding II

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Correct answer is (d) 50 MHz

The best explanation: The maximum frequency that may be needed for an ultrasonic inspection is around 50 MHz. Such frequencies make it easy for the devices to detect the flaws.

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