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What is ultrasonic sound ? with examples ? how much Hz can be a human child (infant) hears ?

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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