UT chapter 2 Flashcards
_______ is a much better carrier of sound energy than air because of its _________
solid, rigidity and density
when the particles of matter vibrate back and forth in the same direction as the motion of the sound wave, they are known as?
longitudinal waves or compression waves
when the particles of matter vibrate back and forth at right angles to the motion of the sound wave, they are known as?
Shear waves or transverse waves.
all materials are made up of?
atoms linked by electromagnetic forces.
waves that travel along the free boundary of a solid are called.
surface waves or rayleigh waves
longitudinal waves can be transmitted through _________,________ and __________ while, shear, surface and plate(Lamb) waves can only be transmitted through________
solids, liquid, even gases, a solid material
describe how a surface wave is formed on the test surface of the test object.
material begins to vibrate as a plate because the wave encompasses the entire thickness of the material.
______ or _______ will cause the reflection of a surface wave.
sharp corners, discontinuity
a surface wave introduced into a material that has a thickness equal to _______ or less of the ultrasound will result in _________ waves being produced.
3 wavelengths, different
unlike other wave modes the velocity of a lamb wave is influenced by the ________ of the wave in addition to the angle of the________ and the ________ of the material
frequency, incidence, material
ultrasonic waves possess properties similar to those of light in that they may be?
reflected, focused, and refracted.
define attenuation:
the loss in acoustic energy that occurs between any two points of travel. this loss may be caused by absorption, reflection, etc.
