Topic 6 Exploring Dtructures Using Waves Flashcards

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1
Q

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

A

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

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2
Q

What do earthquakes and explosions produce

A

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

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3
Q

What does seismologists do

A

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

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4
Q

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

A

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

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5
Q

What can P waves do the S waves

A

Travel through the earths core

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6
Q

What are the two different types of seismic waves

A

P waves and S waves

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7
Q

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

A

Where are the properties of the Earth changed dramatically

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8
Q

Earth

A

Crust
solid mantle
liquid outer core
solid inner core

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9
Q

P waves

A

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

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10
Q

S waves

A

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

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