P1 Topic 4: Waves and the Earth 0.0 / 5 ? PhysicsWaves and SoundEarth in spaceGCSEEdexcel Created by: bridgetadjeiCreated on: 07-05-16 23:56 What is ultrasound? Sound greater than 20,000Hz (20kHz) 1 of 18 What is ultrasound used for? Looking at a foetus; repairing muscle injuries; dolphin commnication 2 of 18 What is infrasound? Sound below 20Hz 3 of 18 What is infrasound used for? Meteor impacts release infrasound; animal communication (eg. tigers and elephants) 4 of 18 What travels faster; P waves or S waves? P waves 5 of 18 What does the P in P waves stand for? Primary 6 of 18 What can P waves travel through? Solids and liquids 7 of 18 What does the S in S waves stand for? Secondary 8 of 18 What can S waves travel through? Solids only 9 of 18 What type of waves are P waves? Longitudinal 10 of 18 What type of waves are S waves? Transverse 11 of 18 What is a seisometer? A piece of equipment which measures the vibrations of the earth 12 of 18 What can various seisometers in different areas working together find? The epicentre (exact place where an earthquake is occurring) 13 of 18 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 14 of 18 In order to find the epicentre, how many seisometers need to be create distance arcs? At least three seisometers 15 of 18 What is triangulation? A method using three or more seisometers to find the epicentre of an earthquake 16 of 18 What are earthquakes caused by? Convection currents in the mantle causing sudden movement of plates 17 of 18 True or false: earthquakes are unpredictable True 18 of 18
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