1. Where are sources for attenuation?
2. What are the differences among A-scan, B-scan, and C-scan?
3. In what way is the acoustic emission method unique?
1. How does infrared thermography detect defects below the surface of a materials?
2. Can you give some examples of NDT in concrete engineering?
1. Why is NDT needed?
2. Which wave will travel faster, a P wave or an S-wave?
3. Why is acoustic impedance an important index?