Which of the following can be used to detect a flaw inside a metal block?

Ultraviolet rays

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X-rays

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Infrasonic waves

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Ultrasonic waves

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Solution

The correct option is B Ultrasonic waves
Ultrasonic waves are sound waves transmitted above the human-detectable frequency range, usually above $20, 000 H z$ . They are used by some animals and in medical or industrial-technological devices.
Ultrasonic impact treatment (UIT) uses ultrasound to enhance the mechanical and physical properties of metals. It is a metallurgical processing technique in which ultrasonic energy is applied to a metal object.

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