# Using Waves GCSE

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 Author: gocalf ID: 268727 Filename: Using Waves GCSE Updated: 2014-04-01 10:06:05 Tags: Seismic Waves WJEC GCSE P3 Folders: Description: a quick set of cards for P3 physics revision Show Answers:

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1. What are P waves?
P-Waves are primary waves, they are longitudinal can travel through liquids and solids and are the first to arrive after an earthquake
2. What are S waves?
S-Waves are secondary waves, they are transverse and can travel through solids only!They arrive after P-waves.
3. What is the structure of the earth?
4. How do we know the structure of the earth?
due to the refraction of s and p waves and the fact that s-waves cannot travel through liquids.
5. What are the two types of waves?
Longitudinal: oscillate in the same direction as travel

• Transverse: oscillate at 900 to the direction of travel.
6. What is refraction?
refraction occurs when a wave travels between two different types of medium it changes direction due to a speed change.
7. What is total internal reflection?
• when light enters a material past its critical angle it totally internally reflects within it.
8. What is lag time and how is it used?
Lag time is the difference in time between the P-wave and the S-wave arriving. It can be used to calculate distance to the epicentre of the earthquake.
9. How do we find the epicentre of an earthquake?
we use the time lag to work out the distance to the epicenter from different locations. we draw circles around these locations and where they cross is the epicentre.
10. how do waves refract at a boundary?

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