Non-Destructive Testing (NDT) Practice Test

Which frequency would measure the largest sound wave from peak to peak?

1. 10kHz

2. 50kHz

3. 100kHz

4. 200kHz

The correct answer is: 100kHz

In the context of measuring sound waves, the frequency determines the number of cycles per second of the wave, which influences the characteristics of the sound being produced. While the amplitude of a sound wave—defined as the maximum extent of a vibration or oscillation from the rest position—plays a crucial role in how loud that sound is perceived, it's essential to recognize that different frequencies interact with materials in distinct ways during measurements. At higher frequencies, such as 100kHz and above, sound waves can reflect off smaller flaws or boundaries within a material. This means that a higher frequency can provide clearer resolution in detecting defects, but it does not inherently mean the wave is larger in amplitude. Both amplitude and frequency are essential, but in the context of the question about measuring the largest sound wave from peak to peak, frequency plays a more significant role because higher frequencies generally produce shorter wavelengths, allowing for better precision and clarity in measurements. Thus, the choice of 100kHz stands out since it strikes a balance between being high enough to maintain clarity while still being capable of producing more substantial measurable peaks compared to lower frequencies. Frequencies like 10kHz and 50kHz may produce larger amplitudes in some contexts, but they do not measure the same