Question

What is the relationship between the frequency of the sound waves and the ability to detect smaller defects in Ultrasonic testing?

• A. Higher frequency waves detect larger defects
• B. Lower frequency waves detect smaller defects
• C. Higher frequency waves detect smaller defects
• D. There is no relationship between frequency and defect size

Hint:

To detect small flaws, use high-frequency ultrasonic waves—they provide better resolution but reduced penetration.

Answer 1

The Correct Option is C

In ultrasonic testing, resolution and the ability to detect small flaws depend on the wavelength of the sound waves used.
Since wavelength is inversely proportional to frequency, using higher frequency waves results in smaller wavelengths.
Smaller wavelengths can interact with and detect smaller discontinuities, making high-frequency waves more suitable for detecting tiny defects.
However, higher frequencies have less penetration capability, so there's always a trade-off between resolution and depth of inspection.