Which property of ultrasonic waves makes them highly effective for detecting internal flaws?

Ultrasonic waves are particularly effective for detecting internal flaws due to their high frequency. High-frequency waves have shorter wavelengths, enabling them to penetrate materials with greater precision and resolution. This fine wave structure allows for better interaction with small discontinuities within the material, such as cracks, voids, and inclusions.

Additionally, high-frequency ultrasonic testing offers improved sensitivity and the ability to distinguish between various types of defects, as the shorter wavelengths can effectively reflect off small internal features. Therefore, utilizing high-frequency ultrasonic waves is crucial for achieving accurate and reliable detection of internal flaws in diverse materials.