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2535891
Waves & the Earth
Descrição
physics unit 1 topic 4
Sem etiquetas
physics
edexcel
waves
earth
physics
Mapa Mental por
larissa.hayden08
, atualizado more than 1 year ago
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Criado por
larissa.hayden08
aproximadamente 9 anos atrás
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Resumo de Recurso
Waves & the Earth
P1.18 Infrasound
frequencies
humans hear between 20Hz-20,000Hz
infrasound - below 20Hz
uses
communication between animals
e.g. whales&elephants
detecting animal movement in remote location
detecting volcanoes&meteors
calculations
P1.19 Ultrasound
frequencies
ultrasound - above 20,000Hz
uses
sonar
find depth of water below boat
communication between animals
e.g. bats&dolphins
foetal scanning
calculations
P1.20 Seismic Waves
P&S waves
caused by earthquakes+explosions
P waves=longitudinal
faster
travel through liquids+solids
S waves=transverse
slower
travel through solids
detected by seismometres
reflection&refraction
seismic waves reflected&refracted
at boundaries between crust,mantle+core
P1.22 Detecting Earthquakes
hard to predict when
unsure of size of forces acting on tectonic plates
unsure of amount of friction on plates
locating earthquakes
1. many seismometers detect P&S waves
2. P=faster so arrives first
greater difference in time between waves=greater difference between seismometer+earthquake
3. scientists work out distance from each seismometer
find out where earthquake happened
at least 3 seismometers used
causes of earthquakes
1. tectonic plates move due to convection currents in mantle
2. plates slide past each other
3. friction-don't slide smoothly
4. forces build up till part of plate breaks
5. plates move with sudden jerk-earthquake!
Anexos de mídia
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