I have heard that certain sound tones can make people physically ill,
causing them to become dizzy/nauseated, throw up or faint, and that
the military has considered using sonar weapons.  Is this true and --
if so -- I need to know the following:

a. Who is the expert in this type of thing?
b. What tones/volume can cause this to happen?
c. Can the "ordinary Joe" make this happen?  Are there any cases of
people doing this?

Thanks!

that is some pretty old technology just search google for infrasound
weapons first link will clue you in

http://www.forteantimes.com/articles/153_sonicweapons.shtml

This is great, elids!  What I am looking for -- to be precise -- is
can you produce feelings of nausea, malaise, et al within a confined
space (such as a room)... not necessarily over a field of battle?

If I remember correctly, a sound of 7 Hertz(on the fringes of the
human ear's hearing range) invokes nausea in the majority of humans.
This is because it is the same "natural frequency" of the stomach, and
so leads to resonance, causing the stomach to vibrate and therefore
regurgitate. This is the same phenomenon that caused in the past some
very famous cases of bridges twisting and collapsing in certain speed
winds.

Hope this helps.

If you want to cause a whole room to feel ill just from sound, the
best means is this:

"C'mon everyone...it's time to do the Macarena!"

we recently had a fire alarm...which we knew was false,the sound,
extremely loud and piercing, made me feel physically sick.  Also my
daughter,but not my husband.
This was a commercial alarm

Here is an article that sites Low-frequency noise from wind turbines
can make people ill.
http://news.telegraph.co.uk/news/main.jhtml?xml=/news/2004/01/25/nwind25.xml

I also know that there is a frequency that can cause a bowel movement.
(cant remember what the frequency is, but i read it somewhere)

I also found an electronic circuit in my travels that generates
frequencies that cause Nausea, Headaches, and general disorientation.
http://www.freeinfosociety.com/electronics/schematics/weaponry/sonicnauseagenerator.pdf

the file is quite bluury (looks to be scanned, I can reproduce it for
you if you like). I am also looking for the components so I can build
one of these and see if it actually works.

The answer to your last question is:yes.The answer to your second one
can be found at: futurehorizons.net.After perusing their site and
using the info found there,the answer to your first query may just
be:you.

There is a show on discovery channel(in canada) that is called
mythbusters, they search for these kinds of myths and other popular
beliefs and they test them in a scientific manner, thay have tested
this myth once and I sugest you to read about this at
www.discoverychannel.ca

I personaly believe that the army did research that subject but found
that it was not usable for them(since we never saw it in riot patrols)