P1 Topic 4: Waves and the Earth

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What is ultrasound?
Sound greater than 20,000Hz (20kHz)
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What is ultrasound used for?
Looking at a foetus; repairing muscle injuries; dolphin commnication
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What is infrasound?
Sound below 20Hz
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What is infrasound used for?
Meteor impacts release infrasound; animal communication (eg. tigers and elephants)
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What travels faster; P waves or S waves?
P waves
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What does the P in P waves stand for?
Primary
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What can P waves travel through?
Solids and liquids
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What does the S in S waves stand for?
Secondary
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What can S waves travel through?
Solids only
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What type of waves are P waves?
Longitudinal
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What type of waves are S waves?
Transverse
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What is a seisometer?
A piece of equipment which measures the vibrations of the earth
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What can various seisometers in different areas working together find?
The epicentre (exact place where an earthquake is occurring)
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How do seisometers help find the epicentre of an earthquake?
Seisometers measure how far the P and S wave move; areas where waves travel in more than one area will overlap to show a precise area
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In order to find the epicentre, how many seisometers need to be create distance arcs?
At least three seisometers
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What is triangulation?
A method using three or more seisometers to find the epicentre of an earthquake
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What are earthquakes caused by?
Convection currents in the mantle causing sudden movement of plates
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True or false: earthquakes are unpredictable
True
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Other cards in this set

Card 2

Front

What is ultrasound used for?

Back

Looking at a foetus; repairing muscle injuries; dolphin commnication

Card 3

Front

What is infrasound?

Back

Preview of the front of card 3

Card 4

Front

What is infrasound used for?

Back

Preview of the front of card 4

Card 5

Front

What travels faster; P waves or S waves?

Back

Preview of the front of card 5
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