Surface waves are reduced to approximately 1/25 of the original power at a depth equivalent to which of the following?

Master Ultrasonic Testing Level 2 Exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Prepare confidently for your certification!

Multiple Choice

Surface waves are reduced to approximately 1/25 of the original power at a depth equivalent to which of the following?

Explanation:
Surface waves fade quickly as you go beneath the surface, so their energy is concentrated near the surface and diminishes with depth. A handy rule of thumb in ultrasonic testing is that the power of surface waves drops to about 1/25 of its surface value at a depth of roughly one wavelength. This makes one wavelength the depth at which the energy is reduced to that level. The other depths—four wavelengths or a few inches—do not match that specific attenuation point, since the depth scale here is tied to the wavelength of the wave, not an absolute measurement in inches.

Surface waves fade quickly as you go beneath the surface, so their energy is concentrated near the surface and diminishes with depth. A handy rule of thumb in ultrasonic testing is that the power of surface waves drops to about 1/25 of its surface value at a depth of roughly one wavelength. This makes one wavelength the depth at which the energy is reduced to that level. The other depths—four wavelengths or a few inches—do not match that specific attenuation point, since the depth scale here is tied to the wavelength of the wave, not an absolute measurement in inches.

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