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What is ultrasonic sound ? with examples ? how much Hz can be a human child (infant) hears ? |
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Answer» ultrasonic SOUND - sound of frequency of more than 20000 Hz which cannot be heard by HUMAN ears . but a human child infant can HEAR UPTO 25000Hz and animals can be hear more than 20000 Hz . e.g. dogs ( upto 50000 Hz ) , cats , bats ,ETC. |
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