Edexcel Physics 1 Topic 4

  1. What name is given to sound with a frequency greater than 20 000 Hz?
  2. Name three uses of ultrasound
    • Sonar - detecting objects under water
    • communication between animals
    • scanning unborn babies
  3. What name is given to sound with a frequency less than 20 Hz?
  4. Name three uses of infrasound
    • communication between animals
    • detecting animal movement in remote locations
    • detecting volcanic eruptions and meteors
  5. What do we call waves that travel through the ground?
  6. Name two things that can cause seismic waves
    • explosions
    • earthquakes
  7. Are seismic waves longitudinal or transverse?
    • They can be either.
    • Longitudinal waves are also known as P waves.
    • Transverse waves are also known as S-waves
  8. Which boundaries within the Earth reflect or refract seismic waves?
    • between the crust and mantle
    • between the mantle and the core
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  9. What do we call the moving plates in the Earth’s crust?
    Image Upload 2
    Tectonic plates
  10. What causes tectonic plates to move?
    • Convection currents in the Earth’s mantle
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  11. What is the cause of Earthquakes?
    • Tectonic plates sliding past each other and getting caught.
    • When sufficient pressure builds up, they are released causing an earthquake.
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  12. What do we call the number of complete waves that pass a point in a second?
    The wave frequency
  13. Name three uses of sonar (using ultrasound)
    • mapping the sea floor
    • detecting submarines
    • detecting shoals of fish
  14. What is the epicentre of an Earthquake?
    • The point on the Earth’s surface directly above the focus of the earthquake
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  15. What are seismometers used for?
    To measure the amount that the ground shakes
  16. What is a tsunami?
    • A huge wave in the sea caused by an earthquake under the sea
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  17. What is the unit of frequency?
    Hertz (Hz)
  18. Which waves travel the fastest, P or S?
    P (seismic longitudinal) waves travel faster than S waves
Card Set
Edexcel Physics 1 Topic 4
Edexcel Physics 1 Topic 4