Physics - Sound and Ultrasound

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  • Created by: becky.65
  • Created on: 20-12-15 18:35
What is sound caused by?
Mechanical vibrations in a substance
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What does sound travel as?
A wave
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What can sound travel through?
Liquids, solids and gases
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What can sound not travel through?
A vacuum
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What type of waves are sound waves?
Longitudinal waves
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What is the range of frequencies that can be heard by the human ear?
20Hz to 20 000Hz
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What happens when sound waves are reflected?
They produce echos
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When does refraction of sound waves take place?
At the boundaries between layers of air at different temperatures
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What does the pitch of a note depend on?
The frequency of the sound waves
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What does the loudness of a sound depend on?
The amplitude of the sound waves
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What are sounds with a higher frequency than 20 000Hz called?
Ultrasound waves
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Why are ultrawaves safer than X-rays?
Because they are non-ionising
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What can ultrasound be used for?
Scanning unborn babies and soft tissue and in therapy
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In an ultrasound scanner, what is a transducer used to produce?
It is used to produce and detect ultrasound waves
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How does the transducer produce a visual image?
Pulses of ultrasound are directed into the body, the pulses partially reflect from tissue boundaries in the body and the transducer detects the reflected pulses and are processed by a computer to give an image
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What might signals also be used to measure?
How far away a boundary is
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Other cards in this set

Card 2

Front

What does sound travel as?

Back

A wave

Card 3

Front

What can sound travel through?

Back

Preview of the front of card 3

Card 4

Front

What can sound not travel through?

Back

Preview of the front of card 4

Card 5

Front

What type of waves are sound waves?

Back

Preview of the front of card 5
View more cards

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