Which of these statements about ultrasonic waves is NOT correct?

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1. Which of these statements about ultrasonic waves is NOT correct?

Ultrasonic waves are used to detect internal flaws, like cracks, in structural materials

Ultrasonic waves can be used to drill holes in very hard materials, like diamond

Ultrasonic waves cannot be reflected, refracted, or absorbed

Ultrasonic waves cannot travel through a vacuum

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Ultrasonic waves behave like any other sound wave and can indeed be reflected, refracted, and absorbed — genuinely useful properties that make flaw-detection and precision drilling possible in the first place.