Waves Flashcards
1
Q
What’s the frequency of ultrasonic sound waves
A
Greater than 20Hz (humans can’t hear it)
2
Q
What happens to ultrasonic waves when meet a boundary between mediums
A
Partially reflected
3
Q
Uses for ultra sound
A
- medical - pre natal scans
- calculating wave depth using formula distance = speed x time
4
Q
What are the two types of seismic wave
A
P - wave
S - wave
5
Q
Properties of a P wave
A
- longitudinal
- primary wave
- can travel through both solids and liquids
6
Q
Properties of a S - wave
A
- transverse
- secondary wave
- can’t travel through liquids
7
Q
Name the four parts of the earth
A
Core, outer core, mantle, crust
8
Q
What is the state of each part of earth
A
Core - solid
Outer core - liquid
Mantle - semi solid
