Topic 6 Exploring Dtructures Using Waves

Question 1

What happens when a wave arrives at a boundary between a material

Answer 1

It can be completely reflected or partially reflected like an ultrasound imaging
The wave me continue travelling in the same direction for a different speed or it may be refracted or observed like S waves

Question 2

What do earthquakes and explosions produce

Answer 2

Seismic waves which can travel through the Earth and we can detect these all over the surface of the planet using seismometers 

Question 3

What does seismologists do

Answer 3

Work out the time it takes for shockwaves to reach the seismometer they also know which part of the Earth don’t receive a shock waves at all

Question 4

What happens when seismic waves reach a boundary between different layers of material inside earth

Answer 4

Some waves will be absorbed and some will be refracted Most of the time if the waves are a fractured they change speed gradually resulting in a curved path but when the properties change suddenly the wave changes are properly on the path has a kink

Question 5

What can P waves do the S waves

Answer 5

Travel through the earths core

Question 6

What are the two different types of seismic waves

Answer 6

P waves and S waves

Question 7

Five serving seismic waves absorbed in refractors what have scientists been able to work out

Answer 7

Where are the properties of the Earth changed dramatically

Question 8

Earth

Answer 8

Crust
solid mantle
liquid outer core
solid inner core

Question 9

P waves

Answer 9

They are longitudinal
they travel through solids and liquids
they travel faster than S waves

Question 10

S waves

Answer 10

Transverse
can’t travel through liquids or gases
slower than P waves