P3.1- Ultrasound

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Humans can detect ultrasound between
20 and 20000 Hz
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Above 20000 Hz
is ultrasound
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Which animals use it to communicate?
bats, dolphins
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Ultrasound scan
Makes images of inside the body
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How?
the waves are partially reflected when they meet a boundary between two different media (eg tissue types)
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Main advantage
Non-ionising so safe to use all over the body
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Disadvantages
Poor image created, you have to know what to look for
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Distance measurements
the distance between interfaces in various media can be worked out by s=v x t
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S is
distance in metres
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V is
speed in metres per second
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T is
time in seconds
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Medical uses
pre natal scanning and the removal of kidney stones
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Other cards in this set

Card 2

Front

Above 20000 Hz

Back

is ultrasound

Card 3

Front

Which animals use it to communicate?

Back

Preview of the front of card 3

Card 4

Front

Ultrasound scan

Back

Preview of the front of card 4

Card 5

Front

How?

Back

Preview of the front of card 5
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