quiz 2 Flashcards
1)
Snell’s law is applicable to the physics of sound?
True
Snell’s law is not applicable to the physics of light?
The angle of reflection is equal to the angle of refraction?
The angle of refraction is not equal to the angle of incidence?
True
The velocity of a shear wave in perspex is equal to the velocity of a shear wave in steel?
In addition to using longitudinal waves at 0 incidence for flaw detection, it is also possible to use them as an angle beam?
100% reflection occurs when a water/steel interface is met?
False
Acoustic impedance determines the transmission of sound across boundaries?
p V = density x velocity and is defined as acoustic impedance?
**A longitudinal wave travelling at a angle in steel reaches an air interface. Which of the following statements are true?
a) a longitudinal wave is reflected
b) a transverse wave is refracted
c) a longitudinal wave is both reflected and refracted
d) both a longitudinal wave and a transverse wave may be reflected**
A couplant reduces the influence of acoustic impedance caused by an air/steel interface?
True
A couplant should wet both surfaces (probe and steel) and be corrosive?
False
A rough surface requires the use of a low viscosity couplant?
A non-corrosive couplant should be usd on a ferritic steel with a fine machined surface?
A water immersion technique uses oil as a couplant?
False
