# Physics AQA P3 Ultrasounds

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What stops the hospital staff getting too much exposure?
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What is an Ultrasound?
High Frequency sound, Above 20,000 Hz, Too high pitched to hear>
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What is the human hearing range?
20Hz-20,000Hz
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What produces Ultrasound?
Bats Dophins and some electronic devices
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Wgat happens when a Ultrasound wave reach a boundary between two substances with different densities?
They re partly reflected back. The rest of the waves continue to pass through.
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What is a Dectector ? and Why is it used?
It can measure the time between an ultrasound wave leaving the source and it reaching the detector. The further the boundary the longer the time taken.
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How is the distance travelled by an ultrasound wave calculated?
S = V x T S= Distance in M V= Speed in M/S T= Time in S
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## Other cards in this set

### Card 2

#### Front

What is an Ultrasound?

#### Back

High Frequency sound, Above 20,000 Hz, Too high pitched to hear>

### Card 3

#### Front

What is the human hearing range?

### Card 4

#### Front

What produces Ultrasound?

### Card 5

#### Front

Wgat happens when a Ultrasound wave reach a boundary between two substances with different densities?