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Sound with a frequency above 20000 hertz
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Jun 28, 2016
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Sound with a frequency above 20000 hertz
Health
middle-school
Mkosmala
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An ultra sound is a sound which has a frequency above 20 000 hertz
Fatemeh Abdollahei
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Jun 28, 2016
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Fatemeh Abdollahei
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A sound with a frequency above 20,000 hertz is called an "ultrasound"
Kathie
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Jul 1, 2016
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