some questions about human auditory system

Jun 22, 2020
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hi, I request you to check first the image and give the response to the questions given below.

1) can we conclude that the suond between 0-40 db and 0-50 hertz (rectangle interval), is inaudible?
2) what is required to ensure any sound (near) ~14.500 hertz and 70db be inaudible?

thanks
 

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