Just FYI, the human ear can usually pick up on everything betweeen 20 Hz and 20,000 Hz. This would mean that the average person could not audibally hear the tone mentioned above. This does not mean it wouldn't effect people. We just couldn't hear it the same way we hear people talking or cars driving by. .01% of the population has perfect pitch. .0000001% (according to census) of the population can hear as low as 12 Hz.
I wonder if anyone could hear something as low as 7.8 Hz. That'd be interesting.
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