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what is a ultrasonic ? HOW IT IS A CIVILISED SOCIETY?

Please refer to the link given below for a similar query :-
https://www.meritnation.com/ask-answer/question/is-ultrasonic-how-it-is-a-ban-or-a-boon-for-a-civilis/sound/7027720

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Ultrasonic sound is the sound pressure waves whose frequency is over the audible range and technically includes anything more than 20000 Hz.. HOPE IT HLPS U.. HV NICE DAY :))

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Ultrasonic sound waves are those sound waves which are of a frequency of more than 20000 hertz.

as a result we cant hear it as it is higher than the sonic range that is 20 to 20000 hertz which we can hear...

i dont know how it is a civilized society since it is not related to the chapter..:(

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