6.6.1.5 Waves for Detection and Exploration Flashcards
1
Q
What can be used for both detection and exploration of structures which are hidden from direct observation?
A
- differences in velocity
- absorption and reflection between different types of waves (solid and liquid)
2
Q
What do ultrasound waves have higher of compared to humans’ upper limit of hearing?
A
- frequency
3
Q
What happens when ultrasound waves meet a boundary between two different media?
A
- partially reflected
4
Q
What can time taken for reflections to reach a detector determine?
A
- how far away a boundary is
5
Q
What does determining how far a boundary is allow for?
A
- ultrasound waves to be used for medical and industrial imaging
6
Q
How are seismic waves produced?
A
- earthquakes
7
Q
What are P-waves?
A
- longitudinal
- seismic waves
8
Q
How do P-waves travel (speed)?
A
- at different speeds through solids and liquids
9
Q
What are S-waves?
A
- transverse
- seismic waves
10
Q
How do S-waves travel?
A
- they cannot travel through a liquid
11
Q
What do P-waves and S-waves provide evidence for?
A
- structure and size of Earth’s core
- discoveries about parts that aren’t directly observable
