Which statement best describes how frequency affects defect detection sensitivity in ultrasonic testing?

• A. Higher frequency transducers provide greater sensitivity
• B. Lower frequency transducers provide greater sensitivity
• C. Frequency has no effect on sensitivity
• D. Only transducer diameter affects sensitivity

Answer: (A)

In ultrasonic testing, how well we can detect a flaw depends on the wavelength of the sound and how sharply the system can resolve features. A higher frequency means a shorter wavelength, which improves both axial and lateral resolution. That stronger resolution makes echoes from small defects stand out more clearly from the surrounding material, increasing the ability to detect them. Keep in mind that higher frequency also causes greater attenuation, so the signal doesn’t travel as far. But for detecting defects within the reachable depth, higher frequency generally enhances sensitivity to small flaws. So the statement that higher frequency transducers provide greater sensitivity best describes the relationship. Lower frequency would miss small details due to poorer resolution, frequency truly does affect sensitivity, and transducer diameter alone doesn’t determine sensitivity.