taregg
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How many hertz can kill a flying house insects...
SteamKing said:If you get a bug zapper, only 60 (electrical) Hz is required to kill a bug. If you try to zap a bug with sound waves, you could wind up zapping yourself.
You could, however, get a copy of that Chinese patent and swat the bug with it. That would probably be more effective.
Read www.hse.gov.uk/research/crr_pdf/2001/crr01343.pdf, and proceed at your own risk.SteamKing said:It's not clear that radiated sound energy powerful enough to zap a bug won't zap a human or a critical part of a human, like an ear, or objects in the room.
taregg said:How many hertz can kill a flying house insects...
Lok said:An impossible task that is. Although there is a small chance of a "kill" frequency (or multiple combined frequencies) to exist it will only be valid for one exact fly, as small anatomical differences will require a totally different frequency.
As stated by ChrisVer a fly is not a clean material so a sound wave will bounce and be absorbed by any tissue with a different speed of sound, thereby easily reducing the chance of resonance. Like "resonating" a box filled with sand.
Bobbywhy said:You seem to have missed the "sweeping of frequencies" technique. This method insures that the insect will be insonified by the correct resonant frequency, at least momentarily.
Bobbywhy said:These passages from the above paper indicate no risk from exposure to airborne ultrasonic frequencies to humans whatsoever:
"For ultrasonic components above 20 kHz, the limits were set to avoid hearing damage in the
audible (lower) frequencies. One-third-octave band levels of 105-115 dB were observed to
produce no temporary hearing loss, and were therefore judged non-hazardous in respect of
permanent hearing damage."