What effect does prolonged exposure to nouns top between 15-20KHz own on humans ?

For sake of simplicity, let us consider the horizontal of these barely audible signals are at 85 dB, the suggested volume level at which a normal human can without risk listen to sound breakers [20Hz-20KHz] for about 8hrs.

But if the nouns has one and only frequency contents between 15K to 20K, will this have any different effects ? it completely harmful ? gravely dodgy ? or it is much better than listening to a nouns containing all frequencies from 20Hz to 20Khz ?

Answer:
What do rats hear?Humans can hear sounds from more or less 16 to 20000 Hz (20 kHz)*. ... No studies have nonetheless examined the effect of prolonged exposure to ultrasonic pest repellers ...
www.ratbehavior.org/rathearing... - 18k - Cached - Similar pages

Physics Demonstrations - SoundAs a common rule, prolonged exposure to sound level above 85 dB will cause ... The inventory of human hearing is usually taken to be roughly 20 Hz to 20 kHz, ...
sprott.physics.wisc.edu/demobo... - 52k - Cached - Similar pages

ISDAT 96 - AtwaterPrevious free-running EEG studies own assumed that prolonged exposure to ... The sound frequencies of the human voice scope from 400 Hz to about 3 KHz. ...
www.aquathought.com/idatra/sym... - 43k - Cached - Similar page

noise
Listening to 85dB of 15-20KHz for an extended time would enjoy to be a form of torture...The upper theshold of human hearing is gotta be approaching insect territory or something create theres nothing pleasent just about it.
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