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Damaging levels of ultrasound?

Nic Phillips nicphillipsNOSPAM at NOSPAMearthling.net
Wed Nov 7 04:58:42 EST 2001

I know that sound frequencies and levels that are damaging to humans have
been discussed on here previously, including the 16Hz odd frequency that
makes you want to go to the loo.

However, I was wondering if anybody knew more details on the effects of
ultrasound on the body.

My example is that a sine wave with a frequency of 4kHz at 160dB is very
damaging to human hearing, but you will also be able to hear that sound
before your hearing is ruined.

What happens when you have a frequency of say around 30kHz, above human
hearing but at a level that would be damaging within the 16-16kHz range.

1. Is the ear able to respond to any frequencies above 20kHz?
2. Is the 20kHz (or 16 or whatever) limit the limit of the brain? Inner ear?
Ear drum?

Thanks for any advice or pointers that anybody can give me about any
damaging effects of ultrasound.

Nic Phillips

PS. Please remove NOSPAM if replying directly to me.

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