Flashcards
Physics 1 Topic 4
Flashcards do conjunto (23)
- 1What are these waves called?Seismic waves.
- 2What are Seismometers?Instruments that can detect these waves.
- 3The place inside the Earth where rock suddenly moves or fractures is called the...Focus of an earthquake.
- 4What is the epicentre?The point on the surface of the Earth directly above the focus.
- 5What two types of waves do earthquakes cause?P waves (longitudinal) and S waves (transverse).
- 6What two types of waves do earthquakes cause?P waves (longitudinal) and S waves (transverse).
- 7What do P waves do?They push and pull on the rock particles as the wave passes.
- 8What do S waves do?They move the rock particles from side to side as the wave passes.
- 9What is the outermost layer of the Earth made out of?Plates.
- 10Tectonic plates are pushed by very slow moving...Convection currents in the mantle.
- 11What is frequency?The number of complete waves that pass a point in one second.
- 12What is it measured in?Hertz (Hz)
- 13What are sound waves?Longitudinal vibrations that travel through a medium (A material).
- 14What does the frequency of a sound wave determine?The pitch of the sound.
- 15Humans can hear sounds in the frequency range....20 to 20,000 Hz (or 20kHz)
- 16What are sounds with frequencies below 20Hz called?Infrasound.
- 17How are they detected?Using microphones.
- 18What is Infrasound useful for?Studying animals.
- 19Natural events such as volcanic eruptions create...Infrasound waves and sounds we can hear.
- 20What are sounds with frequencies higher than 20kHz called?Ultrasound.
- 21What is Sonar equipment used for? And where is it carried?It is carried on ships or submarines to find the depth of the sea or to detect fish.
- 22What happens when an ultrasound scan is made?Some ultrasound waves are reflected each time the waves pass into a different medium.
- 23What are earthquakes? And what do they cause?Movements inside the Earth, that cause waves to be transmitted through the Earth.
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- (Physics 1) FlashCards sobre Physics 1 Topic 4, criado por funkykimberly em 02-06-2013.
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