Evee1 Evee1
  • 14-05-2015
  • Health
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sound with a frequency above 20000 hertz

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Аноним Аноним
  • 17-05-2015
A sound with a frequency above 20,000 hertz is called an "ultrasound"
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amyhyd amyhyd
  • 18-05-2015
An ultra sound is a sound which has a frequency above 20 000 hertz
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