Sound P1.19 - P1.18
- Created by: Natasha Granville
- Created on: 01-05-16 18:40
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- SOUND
- longitudinal wave
- compressions and rare fractions
- particles move back and forth
- parallel with direction of movement
- direction of energy transfer parallel to vibrations
- travels through a medium
- frequency determines pitch
- Infrasound
- uses
- communication between animals
- detection of animal movement in remote locations
- detecting the passage of meteors
- detecting volcano eruptions
- Volcanic eruptions release infrasound
- can be detected with sensors
- Volcanic eruptions release infrasound
- sound waves with frequencies less than 20 Hz
- can't be heard by humans but can be detected using microphones
- uses
- Ultrasound
- sound waves with frequencies greater than 20 000 Hz
- can't be heard by humans but can be detected using microphones
- uses
- communication between animals
- sonar
- loudspeaker on a ship emits a pulse of ultrasound
- reflected by sea bed
- distance = speed x time
- depth is half distance travelled by sound
- because it has to go and come back
- depth is half distance travelled by sound
- used to find depth or detect fish
- loudspeaker on a ship emits a pulse of ultrasound
- foetal scanning
- probe emits and receives ultrasound waves
- machine detects time between sending pulse and receiving echo
- gel used to stop ultrasound reflecting around the skin
- ultrasound safer than x ray
- probe emits and receives ultrasound waves
- sound waves with frequencies greater than 20 000 Hz
- longitudinal wave
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