True or false: Sound requires matter for it to be transmitted
True
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How does sound travel through the air?
A force gets it moving, particles vibrate and as they vibrate they knock into other particles causing it to travel in the direction of the force.
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What frequencies can humans hear between?
20Hz-20,000Hz
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What's the name given for sounds below 20Hz?
Infrasound
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What's the name given for sounds above 20,000Hz?
Ultrasound
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What type of waves are sound waves?
Longitudinal
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Define the term 'infrasound'
Infra-sound is a longitudinal wave with a frequency below 20Hz
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What do volcanoes and earthquakes produce when they occur?
Infrasound
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True or false: Ultrasound can be partially reflected
True
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What can ultrasound be used for in terms of depth?
Ultrasound can be used to find the depth of the sea bed by using ultrasonic emitters which goes to the sea bed, some is reflected from the sea bed and this can be used to find the depth
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How do pre-natal scans work and what type of sound do they use?
They use ultrasound and the sound travels through the body, it then gets reflected as it travels through mediums of different densities. This gives us a representation of the foetus.
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True or false: Infrasound can diffract around hills and travel long distances?
True
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Looking at the previous question; what do tigers use this for?
They use it to mark their territory
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What can we use infrasound for?
We can use it to detect meteor strikes, earthquakes and volcanic eruptions
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What can it mean if lots of animals retreat from an area rapidly?
It can mean an earthquake is inbound as some animals can detect the infrasound waves emitted by earthquakes etc.
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How do you calculate wave speed? Give the units of measurement
Waves speed(m/s) = Distance(m) / Time (s)
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How do you calculate distance? Give the units of measurement
Distance(m) = Wave speed(m/s) X Time (s)
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An ultrasound wave has travelled 1520m/s and took 4.5 seconds to reach the seabed. Work out the distance traveled.
3420(m)=1520(m/s) X 4.5(s)=6480. Divide by two because it's the distance there and back and we just want the distance there.
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A pulse of ultrasound takes 0.00005s to travel to the head of a foetus and back again. The average speed of sound in the body is 1540m/s, calculate the distance of the scanner from the foetus
0.0385(m) = 1540 X 0.00005 / 2
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Other cards in this set
Card 2
Front
How does sound travel through the air?
Back
A force gets it moving, particles vibrate and as they vibrate they knock into other particles causing it to travel in the direction of the force.
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