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14 cards from this deck
Above 20,000 Hz (20 kHz)
No, frequency is too high
Electrical oscillations at any frequency
Converted to mechanical vibrations
Part of wave reflects at boundary, rest transmits
Continues through and may be refracted
Detects boundaries between substances
Using time for echoes to return to detector
Prenatal scanning of foetus
Boundaries between media (e.g. fluid/skin)
Computer processes timing & distribution of echoes
Finding flaws in materials (metal/wood)
From far side of material
Waves reflected sooner than expected
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