Now you might ask, who gives a flip about such a seemingly trivial thing...
Well, its because skeeters are supposedly sensitive to an ultrasonic frequency around 22,000 cycles per second (22khz) or maybe a bit more. And the reason it is supposed to work is because their wings beat at that frequency.
Notice that this is ONLY for female mosquitos who are the only ones who suck...yeah, thats it...suck.
Check this out;
The slow flapping of a butterfly's wing produces no sound, but when the movements are rapid a noise is produced, which increases in shirllness with the number of vibrations.
Thus the house fly, which produces the sound F, vibrates its wings 21,120 times a minute, or 335 times a second; and the bee, which makes a sound of A, as many as 26,400 times, or 440 times in a second. On the contrary, a tired bee hums on E, and therefore, according to theory, vibrates its wings only 330 times a second.
Now what happens if we play around with frequencies to get some reaction from these insects?
There is more that I discovered years ago, but I ain't telling cause it might be COMMERCIAL...and I need the money to fund my lab!
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