Humans can hear sounds in the frequency or pitch range of 20 to 20,000 Hertz (Hz), but most conversations occur between 300 and 3000 Hz.
This refresh rate has to be a minimum of 70 Hz so your eyes won't tire and can't detect screen flickering.
So LCDs operate at lower refresh rates between 60-70 Hz.
Aim for at least 75 Hz for a resolution of 1,024 x 768.
Audiometric testing is done between 125 and 8000 Hz.
Supply Voltage - 115 volt, single phase at 60 Hz.
Refresh rates are measured in Hertz (Hz).
X u x?X x x HZ which exist between aliphatic and benzenoid compounds make the transformations of one class into the other especially interesting.