Nitro-. a combining form or an adjective denoting the presence of niter. Nitro-. a combining form (used also adjectively) designating certain compounds of nitrogen or of its acids, as nitrohydrochloric, nitrocalcite; also, designating the group or radical NO2, or its compounds, as nitrobenzene.
The commonly stated range of human hearing is 20 Hz to 20 kHz. Under ideal laboratory conditions, humans can hear sound as low as 12 Hz and as high as 28 kHz, though the threshold increases sharply at 15 kHz in adults, corresponding to the last auditory channel of the cochlea.
The typical range of human hearing for a child is approximately 20 Hz to 20 KHz, but very few of us over 18 years of age can hear 20 kHz, I do a lot of noise induced hearing loss training and run experiments with guys in the class. Most are lucky to still be playing above about 14 kHz and several below that.But they are older and have been exposed to a working life in a noisy environment. So yeah, it is widely accepted that the range of human hearing is 20 Hz to 20 kHz.ost are lucky to still be playing above about 14 kHz and several below that. But they are older and have been exposed to a working life in a noisy environment. So yeah, it is widely accepted that the range of human hearing is 20 Hz to 20 kHz.