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what are s-waves
s-waves are slower than p-waves. They oscillate at 90`to direction of travel. They can also not travel through liquid.
What are P-waves
P-waves are faster and these oscillate(move back and forth) in the same direction as travel.
What is the structure of the earth
How do we know the structure of the earth?
S-Waves can't travel through the outer core proving it's a liquid.
What are the two types of waves?
S-waves and p-waves. You can also have surface waves
What is refraction?
Refraction occurs when a wave travels between two different types of medium it changes direction due to a speed change.
What is total internal refraction?
When light enters a material past it's critical angle it totally internally reflects within it.
What is time lag and how is it used?
Difference between s and p waves. This can be used to find the epicentre of the earthquake.
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using waves revision cards 2014