Natural Science Forum / Physics / Acoustics / July 2006

I originally posted this message on the newsgroup
rec.music.makers.woodwind, but I'd appreciate getting
feedback from acousticians also.
I'm wondering about the suitable length of the fujara

Dear List Members,
I am doing the measurements of sound power level of a small device
(personal computer) according to ISO 3745:1977 (in anechoic chamber
with reflecting surface).

Water And Nan electronics Will Mix To Create Ultra-dense Memory Storage
Devices.
http://www.studyandjobs.com/IT_Art_3.html
or

I have just got myself involved in some noise measurement work and have
some received basic training. (I plan to do more training) However, in
the meantime I need some advice on measuring background noise.
The situation:

Some things are saltier than others.  What frequency of sound is the
saltiest?
How about the sweetest?  What happens if you mix them together?

Why do my ears feel heavy when listen to an electronic dog-whistle or
any sine-waves around that frequency?
Thanks,
Radium

I am curious to know what the auditory equivalent of black light is.
Black light is long-wave UV light around 400 nanometers.
The auditory equivalent of black light would then be long-wave
ultrasound [i.e. slightly above 20,000 Hz]. Right?

I ran an experiment which involved sending a 2ms broad bandwidth signal
and recording the reflected signal, but I'm curious as to what the
frequency resolution is.  The signal has a bandwidth of 18kHz, with a
center frequency of 18kHz and a start and stop frequency of 9kHz and

I was wondering about the relative weights of chords as played on a
standard piano.  
How much mass does an A major chord have?

Dear friends
I would like to measure indoor the Sound Pressure at distance 1 m from an
enclosed power generator.
Surface of enclosure is too close (1,4m) from the wall.As a result

Is synthetic leather a good sound-proof material?
Thanks,
Radium

For those of you who take this troll seriously, here's just a sampling of
what he has posted in various newsgroups during the past month:
In alt.lasers, Radium wrote:
Hi:

What frequency of sound would be to the ear what 750 THz light is to
the eye?
Thanks,
Radium

As a university work assignment I'm making a preliminary design of an
anechoic chamber.
I receive a suggestion from a technician to install the anechoic
materials (foam wedges)  in a rigid perforated metal sheet backed by a

Why do my ears feel heavy when listen to an electronic dog-whistle or
any sine-waves around that frequency?
Thanks,
Radium