What is the frequency range of ultrasound used in industrial flaw detection (NDT)?

Type: MCQ • Marks: 1

A. 100 Hz to 1,000 Hz

B. Above 20 kHz (typically 1 to 10 MHz)

C. 1 Hz to 10 Hz

D. 10 Hz to 20 Hz

Explanation

Industrial ultrasonics use MHz-frequency waves to detect cracks and structural flaws in metals.

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Class 9th Science (MCQ)

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