Edexcel Physics 1 Topic 4

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What name is given to sound with a frequency greater than 20 000 Hz?

Ultrasound
Name three uses of ultrasound
- Sonar - detecting objects under water
- communication between animals
- scanning unborn babies
What name is given to sound with a frequency less than 20 Hz?

Infrasound
Name three uses of infrasound
- communication between animals
- detecting animal movement in remote locations
- detecting volcanic eruptions and meteors
What do we call waves that travel through the ground?

Seismic
Name two things that can cause seismic waves
- explosions
- earthquakes
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
Which boundaries within the Earth reflect or refract seismic waves?
- between the crust and mantle
- between the mantle and the core
What do we call the moving plates in the Earths crust?

Tectonic plates
What causes tectonic plates to move?
- Convection currents in the Earths mantle
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.
What do we call the number of complete waves that pass a point in a second?

The wave frequency
Name three uses of sonar (using ultrasound)
- mapping the sea floor
- detecting submarines
- detecting shoals of fish
What is the epicentre of an Earthquake?
- The point on the Earths surface directly above the focus of the earthquake
What are seismometers used for?

To measure the amount that the ground shakes
What is a tsunami?
- A huge wave in the sea caused by an earthquake under the sea
What is the unit of frequency?

Hertz (Hz)
Which waves travel the fastest, P or S?

P (seismic longitudinal) waves travel faster than S waves

Author

HLHSscience

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Card Set

Edexcel Physics 1 Topic 4

Description

Edexcel Physics 1 Topic 4

Updated

2014-03-23T10:10:36Z

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