Nic Phillips wrote:
>> 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.
I am forward this to the newsgroup bionet.audiology where a different
group with a possibly higher probability of a good answer might be.